Former Speaker John Boehner John Andrew BoehnerLongtime House parliamentarian to step down Five things we learned from this year's primaries Bad blood between Pelosi, Meadows complicates coronavirus talks MORE (R-Ohio) on Thursday took shots at Sen. Ted Cruz Rafael (Ted) Edward CruzSenate Republicans face tough decision on replacing Ginsburg Cruz: Trump should nominate a Supreme Court justice next week Renewed focus on Trump's Supreme Court list after Ginsburg's death MORE (R-Texas) and said he wouldn't be surprised if Hillary Clinton Hillary Diane Rodham ClintonWhat Senate Republicans have said about election-year Supreme Court vacancies Bipartisan praise pours in after Ginsburg's death Trump carries on with rally, unaware of Ginsburg's death 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: 'Thank god that guy from Texas didn't win' nomination #SALT2016 — Bill Watts (@wlwatts) May 12, 2016

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 Trump Donald John TrumpObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy MORE.

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

John Boehner on calling Ted Cruz 'Lucifer': 'I got criticized by some satantic organization for giving Lucifer a bad name.' #SALT2016 — Matt Egan (@MattMEgan5) May 12, 2016

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.

John Boehner: ‘Anyone who thinks Donald Trump can’t win, just watch. This is going to be a pres. campaign like we’ve never seen.’ #SALT2016 — Matt Egan (@MattMEgan5) May 12, 2016

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.

Boehner: Republicans may not be unified around Trump but they are unified in wanting to win the White House #SALT2016 — SALTConference (@SALTConference) May 12, 2016