Former U.S. President George H. W. Bush shakes hands with Houston Texans wide receiver Andre Johnson before the Houston Texans played against the Buffalo Bills on Nov. 4, 2012. (Photo by Thomas B. Shea/Getty Images)
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President George H.W. Bush goes onto the field before a game between the Houston Cougars and the Navy Midshipmen at TDECU Stadium. Troy Taormina-USA TODAY Sports
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Former President George H.W. Bush waves to the crowd as University of Houston President Renu Khator, left, walks beside him at TEDECU Stadium on November 27, 2015 in Houston, Texas. (Photo by Bob Levey/Getty Images)
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CBS broadcaster Jim Nantz talks with former President George H.W. Bush during halftime for the NCAA Men's Final Four Semifinal between the Villanova Wildcats and the Oklahoma Sooners on April 2, 2016. (Photo by Ronald Martinez/Getty Images)
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Former U.S. President George H.W. Bush (L) and former Houston Oilers head coach O.A. "Bum" Phillips talks on the sidelines before the Houston Texans played the New York Giants at Reliant Stadium on October 10, 2010. (Photo by Bob Levey/Getty Images)
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Former President George H.W. Bush throws out the first pitch to Collin McHugh of the Houston Astros before a game against the Kansas City Royals at Minute Maid Park on April 12, 2016 in Houston, Texas. (Photo by Bob Levey/Getty Images)
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United States former President George H.W. Bush speaks with Texas Longhorns head coach Mack Brown before the game against the Texas A&M Aggies at Kyle Field. Brett Davis-USA TODAY Sports
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Former U.S. President George H.W. Bush (L) sits with Westside Tennis Club owner Jim McIngvale during the Tennis Masters Cup November 12, 2003 at the Westside Tennis Club in Houston, Texas. (Photo by Matthew Stockman/Getty Images)
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Former President George H.W. Bush throws out the ceremonial first pitch to Jed Lowrie as former First Lady Barbara Bush looks on prior to ALDS Game 3 between the Houston Astros and Kansas City Royals on Oct. 11, 2015 (Photo by Bob Levey/Getty Images)
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Former U.S. President George H. W. Bush (R) stands for the National Anthem before the Houston Texans played against the Buffalo Bills on November 4, 2012 at Reliant Stadium in Houston, Texas. Texans won 21 to 9. (Photo by Thomas B. Shea/Getty Images)
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President George H.W. Bush goes onto the field before a game between the Houston Cougars and the Navy Midshipmen at TDECU Stadium. Troy Taormina-USA TODAY Sports
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Former President George Bush is present at the game between the Jacksonville Jaguars and the Houston Texans on November 17, 2002 at Reliant Stadium in Houston, Texas. (Photo by Ronald Martinez/Getty Images)
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Former President George Bush meets with the No. 1 men's singles tennis player of 2004, Roger Federer of Switzerland, inside the Westside Tennis Club during the Tennis Masters Cup on Nov. 16, 2004 in Houston. Photo by Matthew Stockman/Getty Images
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Former President George W. Bush and his father Former President George H.W. Bush wave to the crowd before the Texas Rangers host the San Francisco Giants in Game 4 of the 2010 World Series on Oct. 31, 2010.(Photo by Matt Slocum-Pool/Getty Images
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Former Presidents George H. Bush on the field prior to Superbowl XXXIX at Alltel Stadium in Jacksonville, Florida on February 6, 2005 (Photo by Al Messerschmidt/Getty Images)
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Former President George Bush speaks with Evelyn Husband, wife of Space Shuttle Columbia Commander Rick Husband prior to the Houston Astros home opener against the Colorado Rockies on April 1, 2003. (Photo by Ronald Martinez/Getty Images)
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United States former President George H. W. Bush in attendance during the womens fencing individual sabre final at the Fencing Hall in the 2008 Beijing Olympic Games. Mark J. Rebilas-USA TODAY Sports
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Former President George W. Bush (L) and George H.W. Bush and referee Mike Carey during the coin toss ceremony before the game between the San Francisco 49ers and Houston Texans on October 25, 2009 in Houston, Texas. (Photo by Bob Levey/Getty Images)
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Former President of the United States George W. Bush and his father Former President George H.W. Bush wave to the crowd before the Rangers host the Giants in World Series Game 4 on Oct. 31, 2010. Photo by Christian Petersen/Getty Images
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Former United States President George Bush shakes hands with Michael Jordan during the morning fourballs of the first day of the Ryder Cup at The K Club on September 22, 2006 in Straffan, Co. Kildare, Ireland. (Photo by David Cannon/Getty Images)
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Pitcher Jamie Moyer of the Philadelphia Phillies shakes hands with former President George H.W. Bush before the game on April 11, 2010 in Houston, Texas. (Photo by Bob Levey/Getty Images)
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Former President George Bush (L) and Andre Agassi pose for photographers after Agassi won the US Men's Clay Court Championships at the Westside Tennis Club on April 27, 2003 in Houston, Texas. (Photo by Matthew Stockman/Getty Images)
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Former U.S. President George H.W. Bush congratulates Duke's Mike Krzyzewski after a win against Baylor during the south regional final of the NCAA men's basketball tournament at Reliant Stadium on March 28, 2010. Photo by Ronald Martinez/Getty Images
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Former President George H.W. Bush throws out the ceremonial first pitch prior to the opening day game between the Pittsburgh Pirates and the Cincinnati Reds at Great American Ball Park on March 31, 2003. (Photo by Jonathan Daniel/Getty Images)
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Former U.S. President George H. W. Bush shakes hands with Ernie Els of the International team during the final day singles matches of The Presidents Cup on Sept. 30, 2007, at The Royal Montreal Golf Club in Montreal. Photo by S.Greenwood/US PGA TOUR
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Former President George H.W. Bush greets Ian Poulter and Rory McIlroy of Europe during day two of the Afternoon Four-Ball Matches for The 39th Ryder Cup at Medinah Country Club on Sept. 29, 2012 in Medinah, Ill. Photo by Mike Ehrmann/Getty Images
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Former president George Bush gives thumbs up as wife, Barbara Bush looks on before game one of the National League divisional series at Enron Field in Houston, Texas. The Braves won 7-4. Brian Bahr/ALLSPORT
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United States former President George H.W. Bush watches a game between the Texas Longhorns and Texas A&M Aggies at Kyle Field. Brett Davis-USA TODAY Sports
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Former President George Bush tosses the coin during pre-game inside the Louisana Superdome during the ESPN Monday Night Football game September 25, 2006 in New Orleans. (Photo by Al Messerschmidt/Getty Images)
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Former President George H. W. Bush salutes the flag during the National Anthem with a group of NASA Astronauts from the Space Shuttle Endeavour before the game between the Houston Texans and the Seattle Seahawks. Thomas Campbell-USA TODAY Sports
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Brad Mills, manager of the Houston Astros greets former US President George H.W. Bush at Minute Maid Park on April 8, 2011 in Houston, Texas. (Photo by Bob Levey/Getty Images)
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Former President George H.W. Bush and First Lady Barbara Bush meet with the umpiring crew, Ron Kulpa, Vic Carapazza, Brian Knight and Crew Chief Larry Vanover before the Mariners played the Astros on May 3, 2015. Photo by Bob Levey/Getty Images
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International Team captain Greg Norman, US Team captain Fred Couples and former president George H.W. Bush pose with the Presidents Cup on the first tee on Oct. 8, 2009, in San Francisco. ROBYN BECK/AFP/Getty Images
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United States former President George H.W. Bush watches the Furyk and Perry match during day 2 of the 37th Ryder Cup at the Valhalla Golf Club. Frank Victores-USA TODAY Sports
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Former President George H.W. Bush, former First Lady Barbara Bush, and Jed Lowrie of the Houston Astros pose for a picture prior to Game 3 of the ALDS between the Astros and the Royals on Oct. 11, 2015. Photo by Bob Levey/Getty Images
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United States former President George H. W. Bush attends a game against the Milwaukee Brewers in the ninth inning at Minute Maid Park. Milwaukee beat Houston 5-2. Brett Davis-USA TODAY Sports
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Former President George H.W. Bush and former First Lady Barbara Bush are introduced prior to ALDS Game 3 between the Astros and the Royals on Oct. 11, 2015. (Photo by Bob Levey/Getty Images)
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Country music star Larry Gatlin, left, shares a moment with President George W. Bush, center, and George H.W. Bush before the Houston Texans play the Oakland Raiders on Nov. 17, 2013 in Houston, Texas. (Photo by Bob Levey/Getty Images)
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First Lady Barbara Bush, President George Bush, President Bill Clinton and NFL Commissioner Paul Tagliabue pose with referees on the field before the start of Super Bowl XXXIX on Feb. 6, 2005 in Jacksonville, Fla. Photo: Jed Jacobsohn/Getty Images
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Former US President George H. W. Bush (R) talks with head coach Sean Payton of the New Orleans Saints against the Minnesota Vikings during the NFC Championship Game on Jan. 24, 2010 in New Orleans, Louisiana. (Photo by Jed Jacobsohn/Getty Images)
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United States former President George H.W. Bush watches the Texas A&M Aggies Corps march into the stadium before a game against the Texas Longhorns at Kyle Field. Brett Davis-USA TODAY Sports
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President George H.W. Bush filps the coin before the game between the Houston Texans and the Detroit Lions at NRG Stadium on October 30, 2016 in Houston, Texas. (Photo by Thomas B. Shea/Getty Images)
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Tiger Woods of the U.S. team talks with Former U.S. President George H. W. Bush during the final day singles matches of The Presidents Cup on Sept. 30, 2007, at The Royal Montreal Golf Club in Montreal. (Photo by S.Greenwood/US PGA TOUR)
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Former President of the United States, George W. Bush and his father Former President George H.W. Bush stand with Rangers' President Nolan Ryan before the Rangers host the Giants in the 2010 World Series on Oct. 31, 2010. (Photo by Pool/Getty Images)
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Matt Jones of Australia and Former U.S. President George H. W. Bush poses with the trophy after defeating Matt Kuchar of the United States in Shell Houston Open on April 6, 2014. (Photo by Scott Halleran/Getty Images)
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Tony Romo, Jason Garrett and Jason Wittenstand with former First Lady Barbara Bush and former President H.W. Bush prior to the South Regional Final of the NCAA Men's Basketball Tournament on March 29, 2015. Photo by Ronald Martinez/Getty Images
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Former United States President Bill Clinton (left) and President George H.W. Bush (right) on the sideline in Super Bowl XXXIX between the New England Patriots and the Philadelphia Eagles at Alltel Stadium. USA TODAY Sports
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Former President George Bush and his wife Barbara watch as the Astros take on the Atlanta Braves during game one of the National League Divisional Series at Enron Field in Houston, Texas. Elsa/ALLSPORT
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Former President George H.W. Bush salues home plate umpire Gerry Davis as he makes his way to his seat before the San Diego Padres play the Houston Astros at Minute Maid Park on April 15, 2011 in Houston, Texas. (Photo by Bob Levey/Getty Images)
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President George W. Bush and former president George H. W. Bush pose with gold medallist Michael Phelps and teammate Larsen Jensen after the 2008 Beijing Olympic Games swimming events on Aug.10, 2008 in Beijing. MANDEL NGAN/AFP/Getty Images
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Andy Roddick poses with 41st President George H. Bush after being presented with the ATP Champions Race trophy during the Tennis Masters Cup November 13, 2003 at the Westside Tennis Club in Houston, Texas. (Photo by Clive Brunskill/Getty Images)
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Former President of the United States George Bush Sr. and wife Barbara Bush attend Game Four of the 2005 MLB World Series between the Chicago White Sox and the Houston Astros on October 26, 2005. (Photo by Jed Jacobsohn/Getty Images)
