Republican presidential front-runner Donald Trump seems to have a new barb against Muslims everyday, but he’s doubled down on his suggestion that he saw a video of American Muslims in New Jersey celebrating the attacks on Sept. 11, 2001.

“I’m not going to take it back,” the real estate mogul said on NBC’s “Meet the Press” on Sunday. Now, some American Muslims and their supporters have launched a cheeky hashtag on Twitter called #ISawTrump, lampooning his insistence that such a video of American Muslims exists.

Some of the outlandish tweets under the #ISawTrump hashtag  include that the presidential candidate converted to Islam or was spotted hanging out with Muslims.

“#ISawTrump fasting during Ramadan and then applaud as thousands of Muslims ate halal gyros. There's video - somewhere, maybe, but I saw it,” tweeted playwright and Al Jazeera America host Wajahat Ali.

British journalist Mehdi Hasan, who recently wrote an op-ed in the New York Times longing for the days of George W. Bush’s tolerance toward Muslims, suggested that Trump was just a puppet for the Hillary Clinton campaign.

“#ISawTrump at a secret meeting with Hillary and Bill. And they were slipping him briefing notes. There's a video. Apparently. Somewhere,” tweeted Hasan.

Other tweets ranged from silly to semi-serious.

In addition to his humorous tweets, writer Haroon Moghul tweeted that Trump was known for dissembling.

One Twitter user riffed on the false but persistent rumors that Barack Obama is a Muslim.

A user named Khalid Latif couldn’t resist taking a jab at Trump’s oft-ridiculed hair: