WASHINGTON — House Speaker Paul Ryan condemned GOP front-runner Donald Trump's call for a "complete shutdown" of Muslims coming to the U.S., but said Tuesday he would support Trump if he wins the Republican presidential nomination.

"This is not conservatism. Some of our best and biggest allies in this struggle and fight against radical Islam terror are Muslims," Ryan said Tuesday at a news conference on Capitol Hill. But, he added, "I'm going to support whoever the Republican nominee is and I'm going to stand up for what I believe in as I do that."

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Ryan's comments illustrate the difficult position Republicans face in 2016: How to distance themselves from Trump's more controversial statements, while at the same time sticking to a pledge all 17 initial GOP presidential candidates signed in September, vowing to support their party's eventual nominee.

RNC Chairman Reince Priebus also distanced himself from Trump's proposal, but didn't say whether it would impact his support for Trump if he is the party's nominee.

"I don't agree," Priebus said. "We need to aggressively take on radical Islamic terrorism but not at the expense of our American values.”

"That's as far as I'm going to go," he added.

At a town hall in New Hampshire, Jeb Bush disagreed with Trump's policy, saying it played into the hands of the Islamic State, but declined to say whether he'd support Trump if Trump won the nomination, according to MSNBC reporter Benjy Sarlin.

Jeb at least three times declined to answer whether he'd support Trump if he won nomination. Said he wouldn't be the nominee. — Benjy Sarlin (@BenjySarlin) December 8, 2015

South Carolina Sen. Lindsey Graham was more forceful in his rebuke of Trump in an interview on CNN Tuesday morning, but his campaign did not respond to a Mashable request on whether he'd support Trump as nominee.

"Trump’s a race-baiting, xenophobic, religious bigot," Graham said on CNN. "He doesn’t represent my party. He doesn’t represent the values that the men and women who wear the uniform are fighting for.”

A handful of other Republican presidential candidates have been less forceful in their admonishment of Trump's immigration plan, coming out to say that while they do not agree with Trump's policy, they'll support him if he wins the nomination.

"I disagree with that proposal," Texas Sen. Ted Cruz said of Trump's policy, but added he, "will absolutely support the Republican nominee, but I hope and intend for that nominee to be me."

A spokeswoman for former Arkansas Gov. Mike Huckabee made a similar statement:

Asked if @GovMikeHuckabee would back Trump if GOP nominee, spokeswoman said he believes "Any Republican in the race is better than Clinton" — Michael Shure (@michaelshure) December 8, 2015

Kentucky Sen. Rand Paul told Yahoo News that while he wouldn't be " enthusiastic about it," he would support Trump if he is the party's nominee.

Mashable has reached out to every Republican presidential candidate and will update this post with additional information as it becomes available.