Freshman Democratic Congressmember Ilhan Omar of Minnesota is calling on advertisers to boycott Tucker Carlson, after the Fox News host targeted her in a racist attack on his program Tuesday night. During a three-minute monologue, Carlson blasted Omar—one of the first two Muslim women ever elected to the U.S. Congress—as a “living fire alarm” and “dangerous.”

Tucker Carlson: “After everything America has done for Omar, and for her family, she hates this country more than ever. … Ilhan Omar is living proof that the way we practice immigration has become dangerous to this country. … She’s a living fire alarm, a warning to the rest of us that we better change our immigration system immediately, or else.”

Congressmember Ilhan Omar tweeted in response, “Fox News is now giving a nightly platform to white supremacist rhetoric. It’s dangerous. Advertisers should not be underwriting hate speech.” Tucker Carlson has a history of racist, xenophobic and misogynistic comments; he recently said immigration makes America “poorer, and dirtier, and more divided,” and in 2006 called Iraqis “semiliterate primitive monkeys.”