The GOP will back its presidential nominee “110 percent,” the chairman of the Republican National Committee says, regardless of whether it's Donald TrumpDonald John TrumpMost Americans break with Trump on Ukraine, but just 45 percent think he should be removed: poll Judge orders Democrats to give notice if they request Trump's NY tax returns Trump's doctor issues letter addressing 'speculation' about visit to Walter Reed MORE or someone else.

“I talk to all of our leaders in our party. Everyone is going to get behind whoever the winner is,” Reince PriebusReinhold (Reince) Richard PriebusFounder of veterans group says Trump Jr. can join the military if he 'really wants to understand what sacrifice is all about' Mulvaney faces uncertain future after public gaffes Politicon announces lineup including Comey, Hannity, Priebus MORE said on Fox News’s “Hannity." "We have 12 great candidates. We’ve got a varsity squad out on the field.

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“It’s very difficult to make a decision, because we have got real serious players that are vying for the nomination of our party,” he said.

“Whoever the delegates of the party choose, that is going to be the nominee, and our party is going to be behind that person 110 percent to save this country.”

Priebus said his role as RNC chairman is to ensure that the nominee has the resources needed to win the White House.

“The unifying thing about what I have to do is that no matter who you’re for, everyone can agree that we have to have a national party infrastructure that has its act together,” he said. "Once we get a nominee, what is that nominee going to plug into?

“We have to be a whole lot better than we were in 2012 if we’re going to win in 2016, and that’s what this is about.”

Republicans have one of their most crowded presidential fields in recent memory with 12 candidates. Trump is firmly in the lead in national polls and in the first primary state of New Hampshire.