In the age of Trump and Bannon, it is okay for racists to come out from under their rocks and speak their prejudices.

Congressman Steve King of Iowa tweeted that civilization can’t be restored “with somebody else’s babies.”

He was congratulating a far-right Dutch politician who had complained about the influx of Muslims into the Netherlands.

Critics said that Mr. King echoed the principles of white nationalism, the belief that national identity is linked to the white race and its superiority to other races. Self-proclaimed white nationalists emerged as a small but vocal group during the candidacy of Donald J. Trump, celebrating his promises to crack down on illegal immigration and ban Muslims from entering the United States, as well as heralding his presidential victory as a chance to preserve white culture.

David Duke, the white nationalist and former Ku Klux Klansman who called Mr. Trump “by far the best candidate” during the campaign, celebrated Mr. King’s comments. Duke tweeted “GOD BLESS STEVE KING!!!”

It has been a long time since racism was so openly expressed by a public official. What an embarrassment Cong. King must be to the people of Iowa. I hope.