In recent weeks, Trump has attacked Muslims repeatedly following the attacks in Paris and in San Bernardino, California. He's called for the surveillance and closure of mosques, expressed support when asked about the possibility of a Muslim registry, and repeatedly and falsely claimed that "thousands" of New Jersey Muslims celebrated the fall of the World Trade Center in 2001.
Trump has been defiant in the face of criticism, and on Monday, as a poll showed the Republican down in Iowa where he's held an advantage for months, said the United States should stop all Muslims from entering the United States.
His campaign manager told the Associated Press this would apply to everyone, including tourists.
In a tweet, Trump called the proposal a "very important policy statement":
The reaction on Monday was swift to the comments.
"It's totally un-American to deny anyone the chance to become an American citizen on the basis of their religion," said Robert McCaw, a spokesman and government affairs manager for the Council on American-Islamic Relations.
"The fact that Trump relies on the Center for Security Policy — an organization listed a a hate group by the Southern Poverty Law Center — speaks volumes about who Trump listens to when it comes to being informed about Muslims," he said.
McCaw said that his group and other Muslim leaders might have to stop responding to Trump's comments all together because it only seems to encourage him to talk even more about Muslim-Americans in a negative way. "Frankly, we're a little tired of responding everyday to what Trump says."
When asked about Trump's proposal, a top White House aide said he wasn't sure if the administration would offer a direct response to Trump's plan. But he noted the President Obama's comments from the Oval Office Sunday night, where he warned against discriminating against Muslims in the wake of the San Bernardino shootings.
"It is our responsibility to reject religious tests on who we admit into this country. It's our responsibility to reject proposals that Muslim-Americans should somehow be treated differently. Because when we travel down that road, we lose," Obama said. "Muslim-Americans are our friends and our neighbors, our co- workers, our sports heroes. And, yes, they are our men and women in uniform who are willing to die in defense of our country. We have to remember that."
This is a developing news story. Check back for updates or follow BuzzFeed News on Twitter.
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