Meghan McCain came to the defense of former Vice President Joe Biden Joe BidenBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Democratic groups using Bloomberg money to launch M in Spanish language ads in Florida Harris faces pivotal moment with Supreme Court battle MORE on Friday after President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE's lawyer Rudy Giuliani called him a “mentally deficient idiot.”

McCain, a co-host of “The View” and daughter of Sen. John McCain John Sidney McCainThe Memo: Trump's strengths complicate election picture Mark Kelly: Arizona Senate race winner should be sworn in 'promptly' Cindy McCain: Trump allegedly calling war dead 'losers' was 'pretty much' last straw before Biden endorsement MORE (R-Ariz.), tore into Giuliani shortly after news of his comments circulated on Friday.

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Giuliani told HuffPost on Friday that Biden is “a moron," claiming he finished last in his class at the Syracuse University College of Law.

“I’m calling Joe Biden a mentally deficient idiot,” Giuliani said.

“I am disgusted by Giuliani’s abhorrent and idiotic comments about Joe Biden,” McCain tweeted

I am disgusted by Giuliani’s abhorrent and idiotic comments about Joe Biden. Joe Biden is one of the great political leaders of all time, one of the truly decent men left in politics - and someone my family has looked to for strength during the most difficult time in our lives. — Meghan McCain (@MeghanMcCain) June 15, 2018

Giuliani also fielded questions on whether Biden will run for president in 2020.

Biden, 75, is too old, Giuliani remarked.

“He’s also too old. He’s four years older than Trump,” Giuliani said. Trump turned 72 on Thursday.

Giuliani told HuffPost that a Biden candidacy would not threaten Trump’s chances of reelection.

“They need someone new, who would be more threatening to us,” Giuliani said of Democrats. “They’ve got to hit us with a surprise.”

An aide to Biden declined to comment to HuffPost about Giuliani’s attack.

Biden has been friends with John McCain for 40 years, and the families have spoken about their bond before.

The Senate Armed Services Committee chairman was diagnosed last year with the same cancer that killed Biden’s son, Beau Biden, in 2015.

During an episode of “The View” in December, Biden comforted Meghan McCain over the diagnosis.

“One of the things that gave Beau courage ... was John,” Biden told her. “Your dad took care of my Beau ... became friends with Beau. Beau talked about your dad’s courage. Not about illness, but about his courage."

Biden visited the senator in Arizona while he was recovering from surgery last month.