The claim has been thoroughly debunked by multiple fact checkers. The New Jersey Attorney General investigated rumors of such celebrations immediately after the attack and found them to be “bogus.” Simply put, it did not happen.
Nevertheless, Trump is sticking to his story. On Wednesday night, Trump tweeted this to support his point:
Trump links to Infowars.com, a conspiracy website that pushes the idea that 9/11 was an inside job.
According to Infowars, the massacre at Sandy Hook Elementary was a hoax, FEMA is setting up concentration camps and Andrew Breitbart was assassinated to prevent the release of damaging information about Barack Obama.
Even Infowars’ article doesn't support Trump’s claim that thousands of Muslims were celebrating on 9/11. It’s simply a woman who claims she saw a “pocket” of Muslims celebrating. Similar claims were investigated and found not to be credible.
Trump’s tweet came on a day when he also publicly mocked a reporter’s physical disability.
His antics, however, do not seem to be hurting his standings in the polls. Trump currently leads the Republican primary by 8 points and holds leads in the key early states of Iowa, New Hampshire and South Carolina.