Rep. Justin Amash Justin AmashOn The Trail: How Nancy Pelosi could improbably become president History is on Edward Snowden's side: Now it's time to give him a full pardon Trump says he's considering Snowden pardon MORE (R-Mich.) is endorsing Ted Cruz Rafael (Ted) Edward CruzLoeffler calls for hearing in wake of Netflix's 'Cuties' Health care in the crosshairs with new Trump Supreme Court list 'Parks and Rec' cast members hosting special reunion to raise money for Wisconsin Democrats MORE, giving the GOP contender a potential boost with libertarian-leaning supporters.

Amash, a strong backer of Rand Paul Randal (Rand) Howard PaulSecond GOP senator to quarantine after exposure to coronavirus GOP senator to quarantine after coronavirus exposure The Hill's Morning Report - Sponsored by National Industries for the Blind - Trump seeks to flip 'Rage' narrative; Dems block COVID-19 bill 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 Rubio Marco Antonio RubioFlorida senators pushing to keep Daylight Savings Time during pandemic Hillicon Valley: DOJ indicts Chinese, Malaysian hackers accused of targeting over 100 organizations | GOP senators raise concerns over Oracle-TikTok deal | QAnon awareness jumps in new poll Intelligence chief says Congress will get some in-person election security briefings 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.