Online poll: Trump leads GOP field by 20 points nationally
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Republican presidential front-runner Donald TrumpDonald John TrumpTrump rips Dems' demands, impeachment talk: 'Witch Hunt continues!' Nevada Senate passes bill that would give Electoral College votes to winner of national popular vote The Hill's Morning Report - Pelosi remains firm despite new impeachment push 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 CruzJim Carrey fires back at 'Joe McCarthy wanna-be' Cruz Hillicon Valley: Google delays cutting off Huawei | GOP senators split over breaking up big tech | Report finds DNC lagging behind RNC on cybersecurity GOP senators split over antitrust remedies for big tech MORE and Marco RubioMarco Antonio RubioAnother VPOTUS tries for POTUS: What does history tell us? Tensions swirl around Iran as administration to brief Congress Tensions swirl around Iran as administration to brief Congress 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.