GOP senator to help Cruz, Rubio campaign against Trump
© Greg Nash

Sen. Ben Sasse (R-Neb.) will hit the campaign trail in Iowa with two colleagues, Sens. Marco RubioMarco Antonio RubioPompeo: Countries must 'step up,' provide 'transparent' coronavirus information to save lives China did not count coronavirus positives if patient had no symptoms: report Trump seeks to sell public on his coronavirus response MORE (R-Fla.) and Ted CruzRafael (Ted) Edward CruzFlorida sheriff asks for new leads in disappearance of Carole Baskin's former husband after Netflix's 'Tiger King' drops Ted Cruz jokes about quarantine boredom, 'Tiger King' Trump faces mounting pressure to unleash Defense Production Act MORE (R-Texas), to campaign against GOP front-runner Donald TrumpDonald John TrumpIllinois governor says state has gotten 10 percent of medical equipments it's requested Biden leads Trump by 6 points in national poll Tesla offers ventilators free of cost to hospitals, Musk says MORE.

"We are in a moment of constitutional crisis. America already has one post-constitutional party, we don't need another. We have a president who does not believe in executive restraint, we do not need another," Sasse said in a statement posted to Facebook Tuesday.

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"I am not endorsing any candidate--I am urging conservatives to hold every candidate accountable to keeping their word so that we uphold the Constitution's system of checks and balances," he added.

"I'm pro-Constitution and if that makes me anti-Trump, that's Trump's problem."

Sasse left the door open for joining any "other constitutional candidates," but specifically noted that he's "strongly questioned GOP front-runner Donald Trump."

The freshman senator made his distaste for Trump known in a series of tweets Monday night questioning Trump's previous liberal stances, as well as his "many affairs."