Rep. Ilhan Omar (D-Minn.) endorsed a campaign to pressure advertisers to drop Fox News after a scathing criticism from Tucker Carlson that she called racist.
"Fox News is now giving a nightly platform to white supremacist rhetoric. It's dangerous," Omar tweeted.
"Advertisers should not be underwriting hate speech," she concluded.
She reposted a video of the commentary from Carlson, and a tweet that called it a "racist attack," while calling on advertisers to drop the cable news network and asking Twitter users to pressure them.
"Omar isn't disappointed in America, she's enraged by it," said Carlson in his commentary from his show.
"Virtually every public statement she makes accuses Americans of bigotry and racism. This is an immoral country she says, she has undisguised contempt for the United States and for its people," he adds.
"That should worry you and not just because Omar is a sitting member of Congress.
"Ilhan Omar is living proof that the way we practice immigration has become dangerous to this country. A system designed to strengthen America is instead undermining it. Some of the people we try hardest to help have come to hate us passionately.
"Maybe that's our fault for asking too little of our immigrants, we aren't self confident enough to make them assimilate so they never feel fully American," he continued. "Or maybe the problem is deeper than that, maybe we're importing people from places whose values are antithetical to ours."
In another tweet, Omar responded by calling Carlson a "racist fool" and laughing about the commentary.
"Not gonna lie, it's kinda fun watching a racist fool like this weeping about my presence in Congress," she tweeted with laughing emojis.
"No lies will stamp out my love for this country or my resolve to make our union more perfect," she added. "They will just have to get used to calling me Congresswoman!"
Omar has also been defending herself from attacks by the establishment in the Democratic party after she and several other freshman congresswomen defected against the leadership on a border funding bill.