Donald Trump's plan to ban Muslims from entering the United States is shoving the Republican party to the edge of chaos, abruptly pitting GOP leaders against their own presidential front-runner and jeopardizing the party's longtime drive to attract minorities.

Donald Trump greets guests at a campaign event in Davenport, Iowa. (Photo by Scott Olson/Getty Images)

Trump fired a searing warning on Twitter to fellow Republicans.

He tweeted a majority of his supporters, "Would vote for me if I departed the GOP and ran as an independent."

That would be the GOP's worst fear and almost guarantee a Democratic victory in the presidential election.