A House Republican colleague of Rep. Steve King contributed $2,000 to the Iowan’s 2020 GOP primary challenger, a sign of deep unease about the incumbent returning to Congress amid a string of racist comments.

Rep. Adam Kinzinger of Illinois gave the sum to King’s chief primary rival in his northwest Iowa district, state Sen. Randy Feenstra. It’s rare for sitting lawmakers to back primary challengers to a congressional colleague. But King, 70, is effectively an outcast in the House Republican Conference over comments about immigration, multiculturalism, and other topics. In January, House Minority Leader Kevin McCarthy of California stripped King of all committee assignments after he asked when “white supremacist” and “white nationalist” became offensive terms.