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Donald Trump is still the top pick for Republicans nationwide, but in Iowa, the billionaire is playing catch-up.

FOX's Jared Halpern has the latest poll results from Washington:

More than a third of Republicans nationwide tell a FOX News survey they support Donald Trump's bid for the nomination, but that 35% figure is actually down from last month. Senators Ted Cruz and Marco Rubio follow at 20 and 13%.

Trump dominates the field in New Hampshire as well, leading with 33%. Rubio is second, but well behind at 15%.

But in Iowa, it's Cruz still in control. The Texas Senator led Trump in last month's poll and has increased his lead 27-23, and is the top choice among self-described very conservative caucus goers and white Evangelicals.

In Washington, Jared Halpern, FOX News.

CLICK HERE to read the entire Poll