Clinton called him “ISIS’s best recruiter” and said that they are “showing videos of Donald Trump insulting Islam and Muslims in order to recruit more radical jihadists.” Trump has been under fire by a multitude of politicians since proposing a complete ban of all Muslims entering the country.

However, there is reportedly no evidence to support Clinton’s claim that ISIS is using footage of Donald Trump as a recruitment tool.

Hillary Clinton lied when she said that "ISIS is using video of Donald Trump as a recruiting tool." This was fact checked by @FoxNews: FALSE

— Donald J. Trump (@realDonaldTrump) December 20, 2015

“Knowing the Clintons and knowing Hillary, she made it up,” said Trump in an appearance on ABC’s This Week the day after the Democratic debate. Now he’s requesting that she apologize.

I demand an apology from Hillary Clinton for the disgusting story she made up about me for purposes of the debate. There never was a video.

— Donald J. Trump (@realDonaldTrump) December 21, 2015

It’s not unfounded that Trump’s anti-Muslim sentiment could be used by ISIS recruiters, according to recent media reports. “They love him from the sense that he is supporting their rhetoric,” Rita Katz, an expert with the SITE Intelligence Group which tracks terrorist groups’ social media activity, told NBC News. “When he says, ‘No Muslims should be allowed in America,’ they tell people, ‘We told you America hates Muslims and here is proof.'”

Clinton’s campaign could not immediately be reached for comment.