Rep. Steve King, R-Iowa speaks during the Freedom Summit, on Jan. 24, 2015, in Des Moines, Iowa. Charlie Neibergall / AP, file

“If you go down the road a few generations or maybe centuries with the intermarriage, I’d like to see an America that’s just so homogenous that we look a lot the same,” King added.

King has served in Congress since 2003 and has become an influential voice among the conservative House members. He has a history of making controversial statements when it comes to immigration and race. At an appearance on MSNBC during the Republican National Convention last summer, King questioned the contributions non-whites have made to society.

In 2013 he said for each undocumented immigrant who becomes a valedictorian, there are 100 that have “calves the size of cantaloupes because they’re hauling 75 pounds of marijuana across the desert.”

The Iowa Republican’s latest tweet and subsequent defense were condemned by lawmakers on both sides of the aisle.

Rep. Nancy Pelosi, the Democratic leader in the House, called on House Speaker Paul Ryan to condemn King’s comments. “Once again, disgusting hatred has been met with deafening silence from Speaker Ryan,” she said in a statement.

A spokesperson for Ryan said, “The speaker clearly disagrees and believes America’s long history of inclusiveness is one of its great strengths.”