WASHINGTON D.C. -- A popular Italian restaurant in Washington D.C. has issued an apology, saying it unintentionally hosted a white nationalist group and the diners performed a Nazi salute while eating there.

Maggiano’s Little Italy posted an apology on its Facebook page Monday.

The restaurant said it didn’t realize it was hosting a banquet Friday for a group called the National Policy Institute, whose website says it advocates for the heritage and identity of those of European descent in the U.S.

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The post said the group made reservation at the last minute using a different name. The group was gathered in Washington for a conference and celebrated Republican Donald Trump’s election.

A tweeted photo from former reality star Tila Tequila appeared to show people making a Nazi salute. Her account later seemed to have been suspended.

Maggiano’s said it has donated its profits from the evening to the Anti-Defamation League.

The far right-wing group known as the alt-right latched onto to the Trump campaign -- and some of its leaders say his victory has given them a big boost.

“Hail Trump, hail our people, hail victory,” was heard over the weekend at a meeting in Washington, D.C.

A meeting of the National Policy Institute drew hundreds to the Ronald Reagan pavilion in Washington, CBS News correspondent Jericka Duncan reported.

Since 2008, the alt- or alternative-right movement lived mostly on obscure message boards online. It gained more attention after Trump hired Steve Bannon to run his presidential campaign in August.

Bannon’s Breitbart website is, among other things, seen as the largest platform for the alt-right message -- with more than 300 million views in the last month.

Thirty-eight-year old Richard Spencer, who is president of the National Policy Institute, said he is enthusiastic about Bannon acting as the strategist for President-elect Donald Trump.

“Because Breitbart has been an open place for a lot of ideas that I care about,” he said.

Bannon denies being alt-right.

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