Former Speaker John BoehnerJohn Andrew BoehnerA new kind of hero? Last week's emotional TV may be a sign GOP up in arms over Cheney, Kinzinger Freedom Caucus presses McCarthy to force vote to oust Pelosi MORE (R-Ohio) on Thursday took shots at Sen. Ted CruzRafael (Ted) Edward CruzUp next in the culture wars: Adding women to the draft Biden's bipartisan deal faces Senate gauntlet 228 Republican lawmakers urge Supreme Court to overrule Roe v. Wade MORE (R-Texas) and said he wouldn't be surprised if Hillary ClintonHillary Diane Rodham ClintonFive takeaways from the Ohio special primaries Shontel Brown wins Ohio Democratic primary in show of establishment strength READ: Cuomo's defense against sexual harassment investigation MORE ends up withdrawing from the presidential race.

Addressing the SALT Conference in Las Vegas, the former Speaker suggested that Democrats might have to turn to Vice President Biden to be their 2016 nominee.

Republicans have long speculated that the FBI investigation into Clinton's use of a private email server could result in criminal charges, wounding her candidacy.

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Boehner, who resigned from Congress last fall amid an uprising from conservatives, also hammered Cruz, who was often his adversary in high-profile legislative fights.

"Thank God that guy from Texas didn't win" the nomination, Boehner said.

Boehner had called Cruz "Lucifer in the flesh" and a "miserable son of a bitch" before last week's Indiana primary sealed the Republican nomination for Donald TrumpDonald TrumpFive takeaways from the Ohio special primaries Missouri Rep. Billy Long enters Senate GOP primary Trump-backed Mike Carey wins GOP primary in Ohio special election MORE.

"I got criticized by some satanic organization for giving Lucifer a bad name," Boehner quipped.

Boehner said anyone who thinks Trump can't win the White House should "just watch."

"This is going to be a presidential campaign like we've never seen before," he said.

And he said even if Republicans aren't unified around Trump, he said everyone shares the goal of winning the White House. He predicted the GOP will hold the House this fall despite predictions from Democrats that the chamber could be in play.