Online poll: Trump leads GOP field by 20 points nationally
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Republican presidential front-runner Donald TrumpDonald John TrumpHow to stand out in the crowd: Kirsten Gillibrand needs to find her niche Countdown clock is on for Mueller conclusions Omar: White supremacist attacks are rising because Trump publicly says 'Islam hates us' 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 CruzRafael (Ted) Edward CruzCountdown clock is on for Mueller conclusions Ex-Clinton aide: Dems should make 2020 'about integrity' Cruz: House 'fully intends' to impeach Trump MORE and Marco RubioMarco Antonio RubioCountdown clock is on for Mueller conclusions Rubio wants 'all' of Mueller report made public including founding documents Rubio: Trump reversal on North Korea sanctions 'shouldn't have happened that way' 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.