Gab, the controversial social media platform that has been criticized for hosting white nationalist and neo-Nazi groups, on Thursday slammed the White House for not inviting it to President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE's social media summit.

The White House social media summit, set for Thursday afternoon, boasts a guest list of high-profile online conspiracy theorists and right-wing figures who have crusaded against the country's largest tech companies for allegedly censoring right-wing perspectives.

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YouTube, Twitter and Facebook — the country's largest social media platforms — were not invited to the event.

In a statement, Gab accused the White House of inviting "'safe' z-list MAGA celebrities and cheerleaders" instead of those who have "scarified everything fighting for the uniquely American principles of freedom of expression and individual liberty on the internet."

"Many of these people are or were ardent supporters of President Trump and drove the vast majority of online engagement during the 2016 campaign to get him elected," Gab said in the statement. "Yet their sacrifices and important work on the topic of free expression online has gone unappreciated by the White House."

Gab went offline briefly earlier this year after it was revealed that the man who allegedly killed 11 worshipers in a Pittsburgh synagogue frequently used the platform. Robert Bowers, who has been accused of committing the largest mass shooting against Jewish people in U.S. history, posted on Gab before the attack: "Screw your optics, I'm going in."

Minds.com, a fringe platform with 2 million users that has been criticized for hosting extremist content, was one of the alternative social media platforms invited to the White House social media summit on Thursday. CEO Bill Ottman told The Hill in a phone interview on Thursday that he was invited after he penned a letter to the White House about his vision for transparent and open social media platforms.

Other attendees include conservative activist and Project Veritas founder James O'Keefe, who has been accused of spreading misinformation and false narratives, and Bill Mitchell, a right-wing radio host who is known for spreading the QAnon conspiracy theory.

Gab also criticized the White House for rescinding its invitation to Ben Garrison, a pro-Trump cartoonist whose drawings have been criticized as anti-Semitic.

"Ironically the White House acted in a very similar way to the Big Tech companies by no-platforming Ben Garrison from the event after cartoons that contained anti-war criticism were circulated by the Twitter media elite," Gab wrote.

Trump on Thursday said the summit would focus largely on allegations that companies like Google, Twitter and Facebook are biased against conservatives, a claim that experts and tech firms have said is untrue and has little evidence beyond individual anecdotes to back it up.