Rep. Amash endorses Cruz
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Rep. Justin AmashJustin AmashGOP lawmaker tells party to 'do better' after O'Rourke St. Patrick's Day post The 25 Republicans who defied Trump on emergency declaration Trump: I told Republicans to vote for 'transparency' in releasing Mueller report MORE (R-Mich.) is endorsing Ted CruzRafael (Ted) Edward CruzO'Rourke raised .1 million from over 128,000 donors on campaign's first day O'Rourke on Israeli-Palestinian conflict: 'We don't have the best negotiating partners on either side' O'Rourke: 'I think we can win Texas' in 2020 MORE, giving the GOP contender a potential boost with libertarian-leaning supporters.

Amash, a strong backer of Rand PaulRandal (Rand) Howard PaulRepublicans need solutions on environment too Trio of NFL players intern on Capitol Hill as part of league program Trump keeps tight grip on GOP MORE before he ended his campaign this month, acknowledged Cruz wasn't his first choice but said Tuesday that he could be an "ally" to libertarians.

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"It’s easy to withdraw from politics when the positions and priorities of the candidates do not precisely mirror our own," Amash wrote in an op-ed published by the Independent Journal.

"But we owe it to our beliefs to find constitutional conservative political allies who not only respect our philosophy but also fight for our views to be heard," he added.

"Ted is not a libertarian and doesn’t claim to be. But he is a principled defender of the Constitution, a brilliant strategist and debater who can defeat the Democratic nominee in the general election, and the only remaining candidate I trust to take on what he correctly calls the Washington Cartel."

Amash's endorsement also comes ahead of Tuesday's Nevada Republican caucuses. A recent poll showed Trump up double digits, with Marco RubioMarco Antonio RubioThe Hill's 12:30 Report: Trump feuds heat up Rubio to introduce legislation to keep Supreme Court at 9 seats Stop asking parents to sacrifice Social Security benefits for paid family leave MORE slightly ahead of Cruz for second place.

The House Freedom Caucus member suggested Cruz, a former Supreme Court clerk, could be an asset as Republicans prepare to fight President Obama over replacing the late Justice Antonin Scalia.

Cruz is battling Rubio and Trump after taking third in South Carolina. He's tried to win over Paul supporters, even as the Kentucky senator says he doesn't have plans to endorse in the race.