Billionaire Donald TrumpDonald John TrumpPence: It's not a "foregone conclusion" that lawmakers impeach Trump FBI identifies Pensacola shooter as Saudi Royal Saudi Air Force second lieutenant Trump calls Warren 'Pocahontas,' knocks wealth tax 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 CruzSunday talk shows: Lawmakers gear up ahead of Monday's House Judiciary hearing Trade deal talks expand as Congress debates tech legal shield Sanders meets with MLB Commissioner Rob Manfred 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 Carson'Housing First' approach won't solve homelessness crisis Clarence Thomas blasts his Biden-led confirmation hearings: 'The idea was to get rid of me' Affordable housing crisis demands urgent, sustained action 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 RubioHere are the Senate Republicans who could vote to convict Trump TikTok's leader to meet with lawmakers next week GOP senators unveil bill to expand 'opportunity zone' reporting requirements 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.