Former White House communications director Anthony Scaramucci Anthony ScaramucciScaramucci to Lemon: Trump 'doubling down' on downplaying virus 'should scare' viewers Sunday shows - Leaked audio of Trump's sister reverberates Scaramucci says Trump will display 'classic narcissism' at Republican convention MORE vowed Wednesday to campaign for Joe Biden Joe BidenThe Memo: Warning signs flash for Trump on debates Senate Republicans signal openness to working with Biden National postal mail handlers union endorses Biden MORE if the former vice president wins the Democratic presidential nomination.

During an interview with CNN's Richard Quest, Scaramucci said he would not abandon his GOP affiliation, but would vote for and publicly support Biden in a general election contest against President Trump Donald John TrumpBarr criticizes DOJ in speech declaring all agency power 'is invested in the attorney general' Military leaders asked about using heat ray on protesters outside White House: report Powell warns failure to reach COVID-19 deal could 'scar and damage' economy MORE.

"In an election between Trump and Biden, do you stay as a Republican?" Quest asked.

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"Well, I stay as a Republican but I vote for Joe Biden," Scaramucci replied, adding that he would campaign for Biden if asked.

"Of course I'll campaign for him, we gotta beat Trump. C'mon, it's ridiculous. You know, and your viewers know, how crazy Trump is. And they know that sane people have to work together to beat him," he said.

Scaramucci's remarks are some of the strongest he has leveled against his former boss. He served as communications director in the White House for 10 days before exiting after an explosive confrontation on the phone with a reporter.

Scaramucci previously predicted that Republicans would force Trump from the White House by March 2020. He also thanked former White House chief of staff John Kelly John Francis KellyMORE last month after Kelly criticized Trump.

"I want to thank General Kelly for saving my career and marriage. We have to speak up because @realDonaldTrump is a clear and present danger to our country, our world and way of life. Partriotism requires us to. No one misses your 'action' frankly it’s crazy," Scaramucci tweeted last month, tagging Trump.