President Donald Trump on Wednesday used his Twitter account to boost a baseless smear claiming that Rep. Ilhan Omar (D-MN) danced at an event last week on the anniversary of the 9/11 terror attacks, a claim that’s based on footage that wasn’t actually taken from that day.

Trump’s tweet circulated a video from conservative personality Terrence Williams, in which Williams declared that Omar “partied on the anniversary of 9/11.” In his video, Williams comments on footage of the Muslim congresswoman dancing and fumes that she’s disrespecting the memory of the Sept. 11 attacks.

But the footage of Omar dancing actually came from a Sept. 13 event hosted by the Congressional Black Caucus and wasn’t taken on the 11th, as Williams and Trump wrongly claimed. 

Trump, however, used Williams’ video to declare that Omar would help Republicans win Minnesota. “Ilhan Omar, a member of AOC Plus 3, will win us the Great State of Minnesota,” the president tweeted. “The new face of the Democrat Party!” 

Williams’ original tweet was deleted from Twitter at some point on Wednesday. Twitter confirmed to The Daily Beast that the video post was not removed by the social media site’s administrators but was instead deleted by Williams or someone with access to his Twitter account.

Williams did not respond to a request for comment.

Omar blasted Trump’s smear on Wednesday, tweeting that he has put her life in danger.

“The President of the United States is continuing to spread lies that put my life at risk,” she wrote. “What is Twitter doing to combat this misinformation?”

Trump has frequently targeted Omar with smears, inspiring death threats against the Somali-American lawmaker. In July, Trump suggested that Omar had married her own brother to commit immigration fraud—a baseless claim that’s become increasingly popular on the right, despite being based entirely on a single, anonymous message-board post.