Billionaire Donald TrumpDonald John TrumpGOP congressman slams Trump over report that U.S. bombed former anti-ISIS coalition headquarters US to restore 'targeted assistance' to Central American countries after migration deal Trump says lawmakers should censure Schiff MORE is in first place in the latest NBC News/Wall Street Journal poll.

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Trump now has the support of 27 percent of Republican primary voters, according to the poll, a portion of which was conducted after Trump called for a “total and complete shutdown of Muslims entering the United States.”

Sen. Ted CruzRafael (Ted) Edward CruzThe Hill's Morning Report - Dem debate contenders take aim at Warren The Hill's Morning Report - Trump grapples with Turkey controversy This week: Congress returns to chaotic Washington MORE (R-Texas) moved into second place with 22 percent, gaining 12 points.

Cruz benefited from the fall of retired neurosurgeon Ben CarsonBenjamin (Ben) Solomon CarsonYes, President Trump, we do have a homelessness crisis and you're making it harder for us to address New HUD rule would eliminate housing stability for thousands of students Carson defends transgender comments, hits media for 'mischaracterizations' MORE, pollsters say.

Carson dropped 18 points in the poll, released Sunday morning, falling to fourth place in the crowded GOP presidential field. Carson was atop the last NBC News/Wall Street Journal poll in late October, though Trump has been first in other national polls since then. Carson now is the first choice of 11 percent of GOP primary voters.

Sen. Marco RubioMarco Antonio RubioChina's TikTok turns to former lawmakers to help with content moderation policies Hillicon Valley: Warren turns up heat in battle with Facebook | Instagram unveils new data privacy feature | Advocacy group seeks funding to write about Big Tech TikTok adds former lawmakers to help develop content moderation policies MORE (R-Fla.) has 15 percent support, up 4 percent, to hold the third spot in the new poll.

Former Florida Gov. Jeb Bush, with 7 percent support, and former Hewlett-Packard chief executive Carly Fiorina, with 5 percent, round out the top six.

No other Republican candidate attracted more than 3 percent.

Trump’s support rises to 30 percent against the four top Republican candidates, NBC noted.

The poll of 400 Republican primary voters, conducted Dec. 6–9, has a margin of error of 4.9 percent.