Congresswoman Ilhan Omar (D-Minn.) demanded to know what Twitter would do about false claims spread by President Donald Trump that she “partied” on the anniversary of the 9/11 attacks — lies she says have “put my life at risk.”

The freshman Democrat sounded off Wednesday after the president shared a now-deleted tweet showing herself and fellow Rep. Ayanna Pressley (D-Mass.) dancing to singer/rapper Lizzo‘s smash hit “Truth Hurts.”

The video, which went viral last weekend, was grabbed by right-wing provocateur and comedian Terrence K. Williams, who claimed the footage was taken on the 18th anniversary of the terrorist attacks.

“This is from a CBC event we hosted this weekend to celebrate black women in Congress,” Omar said in a tweet. “The President of the United States is continuing to spread lies that put my life at risk. What is Twitter doing to combat this misinformation?”

Williams’s tweet appeared to have been taken down as of Wednesday afternoon. According to Twitter, the company did not take action on Williams’s tweet. Williams did not immediately respond to an emailed request for comment.

In his message retweeting Williams on Wednesday morning, Trump had claimed: “Ilhan Omar, a member of AOC Plus 3, will win us the Great State of Minnesota. The new face of the Democrat Party!”

AOC is a reference to Rep. Alexandria Ocasio-Cortez (D-N.Y.), who like Omar is a freshman whom Republicans have sought to cast as among the new leadership of the Democratic Party.

The Congressional Black Caucus Foundation’s Annual Legislative Conference took place Sept. 11-15 in Washington. Adam Green, co-founder of the Progressive Change Campaign Committee, tweeted the video of Omar dancing at one of the CBC events on Sept. 13.

The PCCC on Wednesday called the claim that Omar “partied” on the anniversary of the Sept. 11 attacks “an abhorrent lie that endangers a member of Congress.”

“Twitter must remove Trump’s Tweet now,” the organization said.

A spokeswoman for Twitter said it was looking into the matter.

Omar, a freshman Democrat and one of the first Muslim women elected to Congress, has been a frequent target of attacks by Trump and Republicans.

After she addressed the Council on American-Islamic Relations in March, Republicans seized on a snippet of her remarks in which she said the Muslim rights organization “was founded after 9/11, because they recognized that some people did something and that all of us were starting to lose access to our civil liberties.”

Trump has also said that Omar and three other minority women in Congress — Ocasio-Cortez and fellow freshman Democratic Reps. Ayanna Pressley (Mass.) and Rashida Tlaib (Mich.) — should “go back and help fix the totally broken and crime infested places from which they came.”

Three of the four were born in the United States; Omar was born in Mogadishu, Somalia, and became a U.S. citizen as a teenager.

Williams, the conservative comedian Trump retweeted on Wednesday, has spread conspiracy theories in the past. Last month, Williams suggested that the death of Jeffrey Epstein, who had been facing multiple charges of sex trafficking involving underage girls, might be tied to former president Bill Clinton.

Trump retweeted that claim, as well, and defended Williams as “a very highly respected conservative pundit” with “half a million followers” on Twitter.

Trump and Williams have serious problems.

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