Billionaire Donald TrumpDonald John TrumpPompeo changes staff for Russia meeting after concerns raised about top negotiator's ties: report House unravels with rise of 'Les Enfants Terrible' Ben Carson: Trump is not a racist and his comments were not racist 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 CruzGoogle official denies allegations of ties to China The Hill's Morning Report - Presented by JUUL Labs - House to vote to condemn Trump tweet Cruz in 2016 said 'something fundamentally wrong' with Christians who back Trump: book 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 CarsonBen Carson: Trump is not a racist and his comments were not racist Senior Trump administration official to leave post next week Harris, Ocasio-Cortez pitch bill to increase housing assistance for individuals with criminal record 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 RubioTrump administration denies temporary immigrant status to Venezuelans in US Colombian official urges more help for Venezuelan migrants Lawmakers introduce bill to block U.S. companies from doing business with Huawei 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.