Billionaire Donald Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests 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 Cruz Rafael (Ted) Edward CruzCruz blocks amended resolution honoring Ginsburg over language about her dying wish Trump argues full Supreme Court needed to settle potential election disputes Press: Notorious RBG vs Notorious GOP MORE (R-Texas) moved into second place with 22 percent, gaining 12 points.

Cruz benefited from the fall of retired neurosurgeon Ben Carson Benjamin (Ben) Solomon CarsonState AGs condemn HUD rule allowing shelters to serve people on basis of biological sex Biden cannot keep letting Trump set the agenda The Hill's 12:30 Report: Trump heads to New Hampshire after renomination speech 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 Rubio Marco Antonio RubioOvernight Defense: Pentagon redirects pandemic funding to defense contractors | US planning for full Afghanistan withdrawal by May | Anti-Trump GOP group puts ads in military papers Democrats step up hardball tactics as Supreme Court fight heats up Press: Notorious RBG vs Notorious GOP 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.