Billionaire Donald TrumpDonald John TrumpTrump rallies in Nevada amid Supreme Court flurry: 'We're gonna get Brett' Trump: 'Good news' that Obama is campaigning again Trump boosts Heller, hammers 'Wacky Jacky' opponent in Nevada 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 CruzPoll: Cruz leads O'Rourke by 3 in Texas Senate race Julián and Joaquin Castro to campaign with O'Rourke in Texas The Hill's 12:30 Report — Trump rips 'ridiculous' spending bill | FBI dragged into new fight | Latest on Maryland shooting 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 CarsonReport: A third of Ben Carson’s appointees have no housing experience Kavanaugh an excellent fit to continue the Supreme Court's honored tradition GOP strategist: Republican candidates distancing themselves from Trump could backfire in midterms 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 RubioNikki Haley: New York Times ‘knew the facts’ about curtains and still released story March For Our Lives founder leaves group, says he regrets trying to 'embarrass' Rubio Rubio unloads on Turkish chef for 'feasting' Venezuela's Maduro: 'I got pissed' 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.