Hillary Clinton Campaign Doubles Down After Experts Question Claim About ISIS Videos Using Donald Trump

The communications director of Hillary for America appeared on "This Week."

"She’s not referring to a specific video, but he is being used in social media by ISIS as propaganda,” said Palmieri.

When asked about the remark following the debate, the Clinton campaign pointed to a comment from an analyst for the SITE Intelligence Group to NBC News. The report did not mention videos, however, and some national security experts dispute the characterization that Trump is being used as a recruitment tool by key ISIS influencers at all.

"We have seen low-level ISIS supporters talk about Trump's remarks but nothing from core-ISIS and its influential supporters," Seamus Hughes, the deputy director of the George Washington University Program on Extremism, told ABC News.

Trump, appearing separately on "This Week," said Clinton "made up" the claims.

"Knowing the Clintons and knowing Hillary, she made it up," he said.

"What they haven’t found is the video Mr. Trump keeps talking about, this alleged mystery video of thousands of people in [New] Jersey cheering the attacks on the World Trade Center,” she said. "But it is true that he is being used in social media by ISIS to help recruit."