On Thursday, Iowa Rep. Steve King took questions from members of the public at the Greater Des Moines Partnership forum. This sleepy-sounding event was interrupted when King became so enraged by a question about his views on immigration that he demanded security throw the questioner out of the event.

King has long expressed admiration for white supremacists and far-right politicians around the world. He once tweeted that “we can’t restore our civilization with somebody else’s babies.” The person asking the question at the forum, apparently a member of the general public, confronted King with the fact that his language on immigration isn’t that far from what the Pittsburgh shooter wrote before his attack.

The shooter killed 11 Jews in a synagogue last Saturday because he believed Jews were working to bring immigrants into the country, which he described as “invaders” who “kill our people.” The questioner wanted King to explain the difference between his view and the shooter’s, but before he got a chance to finish, King interrupted him. Here’s the exchange:

Q: You and the shooter both share an ideology — KING: No, don’t you do that. Do not! Q: — that’s fundamentally anti-immigration... KING: Do not associate me with that shooter. I knew you were an ambusher when you walked in the room. You have no basis for that. You get no questions and you get no answers. Q: I was about to ask you what distinguishes your ideology. KING: No. You’re done! We don’t play these games in Iowa. Q: I was about to ask you what distinguishes your ideology... KING: No, you’re done. You crossed a line. it’s over. It’s not tolerable to accuse me to be associated with a guy who shot 11 people in Pittsburgh. I am a person who stood with Israel from the beginning. The length of that nation is the length of my life. I’ve been with them all along, and I will not answer that question. I’ll not listen to another word from you. Q: If you don’t have a white supremacist view, then why did you travel to Austria and meet with a white supremacist organization? KING: This is over! ... You’re done! I want to ask whoever is guarding the door to lead this man out of the room.

Here’s video, uploaded by the liberal news site Iowa Starting Line:

Steve King blows up at questioner who pressed him on the Pittsburgh massacre #IA04 pic.twitter.com/7sFQyY9fOW — Iowa Starting Line (@IAStartingLine) November 1, 2018

To be clear, this line of questioning is not unreasonable. There’s no question that King is at least comfortable with befriending white supremacists and neo-Nazis. While leading with the Pittsburgh shooting is pretty inflammatory, asking King what separates him from the worst elements of a movement he’s played footsie with seems like a legitimate thing for a voter to want to know.

Indeed, in the past month alone, King has:

Endorsed an anti-Semite named Faith Goldy in the race for mayor of Toronto

Used money from a Holocaust memorial organization to meet with members of an Austrian far-right party founded by neo-Nazis

Warned in an interview with an alt-right publication that “if we don’t defend Western civilization, then we will become subjugated by the people who are the enemies of faith, the enemies of justice”

King, for his part, seems to see his response at the Q&A as righteous pushback against “Leftist Media Lies” (bear in mind the questioner was not a member of the press):

Leftist Media Lies have reached Peak Insanity and compared me to the evil Pittsburgh murderer of 11 Jews! Here is my reaction. https://t.co/ocOlnS0Zbg — Steve King (@SteveKingIA) November 1, 2018

King’s support for white nationalism has gotten so blatant of late that Rep. Steve Stivers, the head of the House Republican delegation’s official campaign arm, was forced to condemn his colleague:

Congressman Steve King’s recent comments, actions, and retweets are completely inappropriate. We must stand up against white supremacy and hate in all forms, and I strongly condemn this behavior. — Steve Stivers (@RepSteveStivers) October 30, 2018

King’s performative anger, and somewhat odd claim that the “length of [Israel] is the length of my life,” made clear he was offended by the question, but he didn’t provide an actual answer. Instead of explaining any substantive differences between his opposition to immigration and the views of neo-Nazis and white supremacists, King silenced the questioner, making it seem like he doesn’t have a good answer.

The tense exchange comes amid several signs that King’s extreme politics on race and immigration might finally be starting to hurt him politically. Though King sailed to reelection in 2016, his Democratic challenger J.D. Scholten is closing in recent polls. My colleagues Tara Golshan and Ella Nilsen report that Scholten has massively outraised King; major corporations that have donated to King before, like Intel and Purina, have cut him off in this cycle.

If King loses — his district is deep-red — the reason will be clear: He was extremely unsubtle about his appeals to white supremacist sentiment.