Poll: Trump holds 17-point lead
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Donald TrumpDonald John TrumpGillibrand backs federal classification of third gender: report Former Carter pollster, Bannon ally Patrick Caddell dies at 68 Heather Nauert withdraws her name from consideration for UN Ambassador job 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 CruzPoll shows competitive matchup if O’Rourke ran for Senate again Democrats veer left as Trump cements hold on Republicans O’Rourke heading to Wisconsin amid 2020 speculation MORE (Texas) and Marco RubioMarco Antonio RubioOn The Money: Trump declares emergency at border | Braces for legal fight | Move divides GOP | Trump signs border deal to avoid shutdown | Winners, losers from spending fight | US, China trade talks to resume next week Trump declares national emergency at border Democrats veer left as Trump cements hold on Republicans 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 ClintonSanders expected to announce exploratory committee next week Bernie Sanders records announcement video ahead of possible 2020 bid Overnight Defense: Trump declares border emergency | .6B in military construction funds to be used for wall | Trump believes Obama would have started war with North Korea | Pentagon delivers aid for Venezuelan migrants MORE leads Sen. Bernie SandersBernard (Bernie) SandersSanders expected to announce exploratory committee next week Bernie Sanders records announcement video ahead of possible 2020 bid Bill Maher to Dems: ‘Let’s not eat our own’ in 2020 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.