Donald Trump is gaining ground in Iowa, a new Fox News poll found.
With one week before the Iowa caucuses, Trump leads Ted Cruz, 34 percent to 23 percent.
The most recent poll showed Marco Rubio was in third at 12 percent, followed by Ben Carson at 7 percent. Rand Paul, the poll found, was polling at 6 percent in Iowa.
The poll found 20 percent of likely Republican caucusgoers said they would refuse to vote for Trump if he was the Republican nominee; 14 percent said they would refuse to vote for Jeb Bush if he was the nominee.
The Fox News poll was conducted Jan. 18 through Jan. 21. The results show a shift in opinions from earlier Fox News surveys, which found Cruz was leading the pack in Iowa.
The Iowa caucuses are Feb. 1
Trump still dominates in New Hampshire, found a Fox News poll conducted during the same time period. That survey shows Trump leads Cruz, 31 percent to 14 percent. Rubio is in third at 13 percent, John Kasich follows at 9 percent. Bush and Chris Christie are tied at 7 percent.
The New Hampshire primary is Feb. 9.