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 said Sen. John McCain John Sidney McCainAnalysis: Biden victory, Democratic sweep would bring biggest boost to economy The Memo: Trump's strengths complicate election picture Mark Kelly: Arizona Senate race winner should be sworn in 'promptly' MORE's (R-Ariz.) has shown Americans what “the words grace and grit really mean” after McCain's family announced on Friday that he has chosen to discontinue medical treatment of his aggressive brain cancer.

God bless John McCain, his family, and all who love him — a brave man showing us once again what the words grace and grit really mean. https://t.co/9aiLxCF24E — John Kerry (@JohnKerry) August 24, 2018

McCain’s family issued a statement announcing the Arizona Republican would no long be receiving medical treatment more than a year after he was first diagnosed.

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His illness was discovered in July 2017 after he had surgery to remove a blood clot above his left eye.

The announcement came less than a week before the senator's 82nd birthday.

McCain, the 2008 GOP presidential nominee, has been one of President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE's sharpest GOP critics.

In recent months, McCain urged his Senate colleagues to oppose Trump's nominee for CIA director, Gina Haspel, saying that “her refusal to acknowledge torture’s immorality is disqualifying.”

He also voted "no" on the Republican effort to repeal ObamaCare last year with a dramatic thumbs-down gesture, preventing its passage, which the president has repeatedly mocked at rallies since.