Online poll: Trump leads GOP field by 20 points nationally
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Republican presidential front-runner Donald TrumpDonald TrumpPence takes victory lap at CPAC: ‘This is our time’ President Trump, immigrants are not 'bad dudes' Zuckerberg group donated to Trump transition 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 CruzThe Hill's 12:30 Report Cruz predicts another Supreme Court vacancy this year Cruz: Democratic base is 'bat-crap crazy' MORE and Marco RubioMarco RubioRubio brushes off demonstrator asking about town halls A guide to the committees: Senate Schumer: GOP will break from Trump within months 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.