Senate candidate and former Massachusetts Gov. Mitt Romney Willard (Mitt) Mitt RomneySenate GOP aims to confirm Trump court pick by Oct. 29: report The Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting Senate GOP sees early Supreme Court vote as political booster shot MORE (R) said Saturday that those who mock Arizona Sen. John McCain John Sidney McCainCindy McCain endorses Biden: He's only candidate 'who stands up for our values' Biden says Cindy McCain will endorse him Biden's six best bets in 2016 Trump states MORE's (R) failing health "humiliate themselves."

His comments follow The Hill's report that White House special assistant Kelly Sadler mocked McCain's cancer diagnosis during a meeting with communication staffers Thursday morning.

"John McCain makes America great. Father, grandfather, Navy pilot, POW hero bound by honor, an incomparable and irrepressible statesman. Those who mock such greatness only humiliate themselves and their silent accomplices," Romney wrote.

John McCain makes America great. Father, grandfather, Navy pilot, POW hero bound by honor, an incomparable and irrepressible statesman. Those who mock such greatness only humiliate themselves and their silent accomplices. — Mitt Romney (@MittRomney) May 12, 2018

Sadler reportedly made the comments Thursday in reference to McCain's letter to colleagues urging them to reject Trump's nomination of Gina Haspel to lead the CIA. The Arizona senator was diagnosed with brain cancer last year.

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“It doesn’t matter, he’s dying anyway,” Sadler said, according to a source familiar with the remarks at the meeting. The White House would not confirm or deny the remarks during a Friday press briefing with press secretary Sarah Huckabee Sanders, who declined to comment on closed-door meetings.

The reported remarks sparked fury on Capitol Hill and in the media, where lawmakers from both sides of the aisle demanded apologies from Sadler and the White House.

Former Secretary of State John Kerry John Forbes KerryThe Memo: Warning signs flash for Trump on debates Divided country, divided church TV ads favored Biden 2-1 in past month MORE, who also served in the Navy remarked that he and McCain learned some "four letter" words while serving that could be applied to McCain's critics.

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"Actually Jeff, you’re too kind," Kerry wrote after Sen. Jeff Flake Jeffrey (Jeff) Lane FlakeJeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Republican former Michigan governor says he's voting for Biden Maybe they just don't like cowboys: The president is successful, some just don't like his style MORE (R-Ariz.) tweeted that "there are no words" in response to the Sadler report.

"There are words - four letter ones. If @SenJohnMcCain and I didn’t know how to use them before the Navy, we became fluent in them then. And they all apply to anyone who would say anything like that about John or any family battling cancer."

Actually Jeff, you’re too kind. There are words - four letter ones. If @SenJohnMcCain and I didn’t know how to use them before the Navy, we became fluent in them then. And they all apply to anyone who would say anything like that about John or any family battling cancer. https://t.co/oJ9A3YDkNL — John Kerry (@JohnKerry) May 11, 2018

In a statement to The Hill, the White House said that it respects the ailing senator's service to the country.

“We respect Senator McCain’s service to our nation and he and his family are in our prayers during this difficult time,” the White House said.