Online poll: Trump leads GOP field by 20 points nationally

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Republican presidential front-runner Donald TrumpDonald TrumpTrump camp touts million raised since debate Trump reveals how he calmed his nerves before debate GOP lawmakers give Trump bad reviews on debate performance 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 CruzFunding bill rejected as shutdown nears Cruz: Clinton 'tired' and 'formulaic' during debate The Trail 2016: Fight night MORE and Marco RubioMarco RubioObama nominates ambassador to Cuba Rubio praises Marlins pitcher José Fernández on Senate floor Glenn Beck: I was wrong about Ted Cruz 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.