Donald Trump and Ted Cruz continue to dominate the race. | AP Photo Fox News national poll: Trump up 14 points over Cruz

Donald Trump leads the Republican field by a significant margin heading into the Iowa caucuses, according to a Fox News national poll out Friday.

The businessman has 34 percent of those surveyed, Texas Sen. Ted Cruz comes in second at 20 percent, Florida Sen. Marco Rubio has 11 percent and retired neurosurgeon Ben Carson has 8 percent.


Everyone else has 4 percent or less. Combined, the top four GOP contenders account for nearly three-quarters of those surveyed.

The poll also found that few Republican voters are much fussed about Trump’s recent attacks on Cruz’s citizenship — 88 percent said it was not a concern, and only 10 percent said it would make them less likely to vote for Cruz. Sixty-one percent of registered voters in the poll said that Cruz is eligible to be president, while 27 percent said they don't believe he is. (For this question, respondents were first prompted with the fact that "The U.S. Constitution requires the president to be a natural-born citizen.")

Other results pointed at why outsider candidates like Trump and Cruz continue to dominate the race: Eighty-five percent of Republican voters surveyed said they were either angry or dissatisfied with the way the federal government was running, which includes 39 percent who specifically said they were angry.

The telephone poll of 1,009 registered voters was conducted Jan 18-21. It has a margin of error of plus or minus three percentage points for the full sample, and 4.5 percentage points for a subsample of 405 Republican primary voters.