Online poll: Trump leads GOP field by 20 points nationally
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Republican presidential front-runner Donald TrumpDonald TrumpJuan Williams: Trump refills the swamp Pelosi: Trump insisted he won popular vote in our first meeting NYT's David Brooks: Trump has not fulfilled promise of new conservatism MORE is atop the GOP field by 20 points nationally ahead of votes in South Carolina and Nevada, according to a new online poll.

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The NBC News/Survey Monkey poll released Tuesday morning shows Trump with 38 percent support. Ted CruzTed CruzThis week: Senate races toward ObamaCare repeal vote McConnell allies confident in healthcare win GOP’s message on ObamaCare is us versus them MORE and Marco RubioMarco RubioElection hacking fears turn heat on Homeland Security Will Republicans stand up to the NRA's insurrection rhetoric? The Hill's Whip List: Senate ObamaCare repeal bill MORE follow with 18 and 14 percent respectively. Rubio fell 3 points in the latest survey.

No other GOP candidate attracted double-digit support.

Following the Iowa caucuses and New Hampshire primary, more Republican voters now believe Trump will be the eventual nominee. Fifty eight percent believe he will win the nomination, up 14 percent in a week.

The Republican field, however, faces a more conservative and evangelical electorate in South Carolina this weekend. Pollsters found that Trump's lead over Cruz among white evangelicals has shrunk 11 points, standing now at just 9 points.

The weekly tracking poll of 13,129 adults, conducted from Feb. 8 through Feb. 14, has an error estimate of 1.1 percentage points.