Poll: Trump holds 17-point lead
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Donald TrumpDonald John TrumpTrump: I hope voters pay attention to Dem tactics amid Kavanaugh fight South Korea leader: North Korea agrees to take steps toward denuclearization Graham calls handling of Kavanaugh allegations 'a drive-by shooting' MORE continues to hold a big lead in the race for the 2016 Republican presidential nomination, leading his closest rivals by double digits in an NBC News/Survey Monkey poll released Tuesday.

The billionaire businessman is supported by 35 percent of Republican and GOP-leaning registered voters in the online survey, with Sens. Ted CruzRafael (Ted) Edward CruzGOP candidate scores upset win in Texas state Senate runoff McConnell tamps down any talk of Kavanaugh withdrawal Cornyn takes on O'Rourke over AR-15s MORE (Texas) and Marco RubioMarco Antonio RubioRubio unloads on Turkish chef for 'feasting' Venezuela's Maduro: 'I got pissed' For Poland, a time for justice Judiciary Democrat calls for additional witnesses to testify on Kavanaugh MORE (Fla.) at 18 percent and 13 percent, respectively.

All other candidates poll in single digits, with retired neurosurgeon Ben Carson at 9 percent, former Florida Gov. Jeb Bush at 6 percent, New Jersey Gov. Chris Christie at 4 percent and businesswoman Carly Fiorina at 3 percent.

A third of white evangelicals surveyed, 33 percent, support Trump, while Cruz gets 21 percent and Rubio 10 percent of that group, a key support group candidates are focusing on in the early voting state of Iowa.

Trump is also supported by 35 percent of "very conservative" voters, versus 30 percent for Cruz and 8 percent for Rubio.

The poll comes about a month out from votes being cast in the race in the Iowa causes Feb. 1, where Cruz is the favorite to win, and the New Hampshire primaries Feb. 9, where Cruz and Rubio poll behind Trump.

Cruz and Rubio have largely avoided attacking Trump and have focused their barbs on each other recently, duking it out on the issue of national security and immigration heading into the next debates later this month.

On the Democratic side of the field, Hillary ClintonHillary Diane Rodham ClintonHillary Clinton: FBI investigation into Kavanaugh could be done quickly Hillary Clinton urges Americans to 'check and reject' Trump's 'authoritarian tendencies' by voting in midterms EXCLUSIVE: Trump says exposing ‘corrupt’ FBI probe could be ‘crowning achievement’ of presidency MORE leads Sen. Bernie SandersBernard (Bernie) SandersWarren joins Sanders in support of striking McDonald's workers Kavanaugh allegations could be monster storm brewing for midterm elections      Senate approves 4B spending bill MORE (I-Vt.) 53 percent to 36 percent, with just 2 percent of registered and leaning Democrats supporting former Maryland Gov. Martin O'Malley.

The survey of 3,700 adults nationally was conducted Dec. 28 through Jan. 3 with an overall margin of error of 1.9 points. The margin of error for the 949 GOP registered voters surveyed is 3.7 points and 3.3 points for the Democrats.