White House press secretary Sarah Huckabee Sanders reportedly scolded her staff on Friday after one White House official's derisive comment about Sen. John McCainJohn Sidney McCainCongress brings back corrupt, costly, and inequitably earmarks Trump knocks CNN for 'completely false' report Gaetz was denied meeting The Hill's Morning Report - Presented by Tax March - Biden, lawmakers start down a road with infrastructure MORE (R-Ariz.) became public.

In the meeting with communications staffers, Sanders called the comment by special assistant Kelly Sadler "unacceptable," according to ABC News, but sources told the network she was more upset over the leak of the remark.

“I am sure this conversation is going to leak, too. And that’s just disgusting,” she said according to a report by Axios on Saturday.

White House budget chief Mick MulvaneyMick MulvaneyHeadhunters having hard time finding jobs for former Trump officials: report Trump holdovers are denying Social Security benefits to the hardest working Americans Mulvaney calls Trump's comments on Capitol riot 'manifestly false' MORE on Saturday also condemned the comment making its way to the press. During an appearance on Fox News, Mulvaney called Sadler's comment a "bad joke" but said it was "inconsiderate" that it leaked.

The Hill first reported Thursday that Sadler said during a private meeting that McCain's opposition to President TrumpDonald TrumpBiden administration still seizing land near border despite plans to stop building wall: report Illinois House passes bill that would mandate Asian-American history lessons in schools Overnight Defense: Administration says 'low to moderate confidence' Russia behind Afghanistan troop bounties | 'Low to medium risk' of Russia invading Ukraine in next few weeks | Intelligence leaders face sharp questions during House worldwide threats he MORE's nominee to become CIA director, Gina Haspel, "doesn't matter" because "he's dying anyway." 

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McCain, 81, is in Arizona battling brain cancer.

The comment prompted fierce pushback from lawmakers and the news media on Friday, while Sanders was grilled over the comment during the daily press briefing.

Mercedes Schlapp, the White House director of strategic communications, said Friday during a White House meeting that she stood by Sadler, Axios reported.

“You can put this on the record. ... I stand with Kelly Sadler," she said, according to Axios.

A source told the news outlet that she was emphasizing that staff members should defend their colleagues whose comments get leaked to the press.