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 called Cindy McCain, the wife 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, on Friday to check in on the senior Arizona Republican, who is in the hospital, according to media reports.

President Trump spoke by phone today with Cindy McCain to check in on Senator McCain, who is fighting to recover from side effects of his cancer treatment at Walter Reed Medical Center, @PressSec Sarah Sanders tells CNN tonight. — Jeff Zeleny (@jeffzeleny) December 15, 2017

President Trump called Cindy McCain this afternoon to check in on Sen. John McCain’s health, according to a senior White House official. — NBC Politics (@NBCPolitics) December 15, 2017

McCain was hospitalized this week at Walter Reed Medical Center in Maryland due to side effects from his cancer treatment.

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He was diagnosed earlier this year with glioblastoma, an aggressive form of brain cancer.

He suffered a minor tear in his Achilles tendon last month as a result of the treatment, his office said.

McCain's hospitalization comes days before the Senate is expected to vote on a sweeping tax overhaul. McCain has not yet said whether he will support the measure, though he voted in favor of Senate Republicans' initial bill earlier this month.