Biden hits White House staffer's comment on McCain: 'Decency' has 'hit rock bottom with this administration'
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Former Vice President Biden has issued a harsh rebuke of the White House staffer who mocked Sen. John McCainJohn Sidney McCainObama, Bush veterans dismiss Trump-Putin interpreter subpoena Controversial Trump judicial nominee withdraws Trump vows to hold second meeting with Putin MORE (R-Ariz.) at an internal meeting.

The Hill reported that, in a closed-door meeting on Thursday, special assistant Kelly Sadler dismissed McCain's opposition to President TrumpDonald John TrumpWSJ: Trump ignored advice to confront Putin over indictments Trump hotel charging Sean Spicer ,000 as book party venue Bernie Sanders: Trump 'so tough' on child separations but not on Putin MORE's CIA nominee, saying, “It doesn’t matter, he’s dying anyway." 

Last year, McCain revealed that he had been diagnosed with an aggressive form of brain cancer. He is currently being treated in Arizona.

"People have wondered when decency would hit rock bottom with this administration. It happened yesterday," Biden, a close friend of McCain's, said in a statement. "John McCain is a genuine hero — a man of valor whose sacrifices for his country are immeasurable. As he fights for his life, he deserves better — so much better."

Biden called the remark the "epitome" of the White House's "trail of disrespect."

"Our children learn from our example," the former Delaware senator said. "The lingering question is whose example will it be. I am certain it will be John’s."

Sadler called Meghan McCain to apologize for the comment about her 81-year-old father, but "The View" co-host appeared unmoved on Friday.

“I don't understand what kind of environment you're working in when that would be acceptable, and then you could come to work the next day and still have a job," Meghan McCain said.