Online poll: Trump leads GOP field by 20 points nationally
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Republican presidential front-runner Donald TrumpDonald TrumpBiden administration still seizing land near border despite plans to stop building wall: report Illinois House passes bill that would mandate Asian-American history lessons in schools Overnight Defense: Administration says 'low to moderate confidence' Russia behind Afghanistan troop bounties | 'Low to medium risk' of Russia invading Ukraine in next few weeks | Intelligence leaders face sharp questions during House worldwide threats he 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 CruzCruz no longer wearing mask in Capitol The Hill's Morning Report - Presented by Tax March - CDC in limbo on J&J vax verdict; Rep. Brady retiring Democrats brace for new 'defund the police' attacks MORE and Marco RubioMarco Antonio RubioHillicon Valley: Biden administration sanctions Russia for SolarWinds hack, election interference Senators reintroduce bill to block NATO withdrawal New US sanctions further chill Biden-Putin relations 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.