Former Speaker John BoehnerJohn Andrew BoehnerBipartisanship has become a partisan weapon The Memo: Lawmakers on edge after Greene's spat with Ocasio-Cortez What's a party caucus chair worth? MORE (R-Ohio) on Thursday took shots at Sen. Ted CruzRafael (Ted) Edward CruzBipartisanship has become a partisan weapon Former OMB pick Neera Tanden to serve as senior adviser to Biden Seth Rogen says he's not in a feud with 'fascist' Ted Cruz, whose 'words caused people to die' MORE (R-Texas) and said he wouldn't be surprised if Hillary ClintonHillary Diane Rodham ClintonCongress won't end the wars, so states must Democrats say it's up to GOP to stop Trump 2024 Hillary Clinton to speak at Asian Americans and Pacific Islanders summit 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 TrumpFranklin Graham says Trump comeback would 'be a very tough thing to do' Man suspected in wife's disappearance accused of casting her ballot for Trump Stefanik: Cheney is 'looking backwards' 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.