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 again mocked 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 (R-Ariz.) on Saturday for McCain’s thumbs-down vote on the Republican plan to repeal ObamaCare.

Though Trump did not mention McCain by name, he has attacked the senator several times in recent weeks for his “no” on the GOP measure and has blamed McCain for the collapse of the Republican effort to repeal the act.

Trump at a GOP rally in Nevada said McCain went thumbs-down on the bill, a reference to McCain using the gesture to signify his vote.

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"Nobody talked to him. Nobody needed to, and then he walked in: thumbs-down. It’s alright, because we’ve essentially gutted it anyway," Trump said of ObamaCare at the rally.

McCain's daughter, Meghan McCain, has called the president’s mockery of her father “gross.”

Campaigning for Heller in Vegas, Trump is again attacking @SenJohnMcCain (although not directly by name) for his “thumb’s down” vote on Obamacare repeal. — Philip Rucker (@PhilipRucker) June 23, 2018

John McCain was diagnosed with brain cancer in July 2017, and has since undergone surgery and treatment. He has assumed a reduced role in the Senate since his diagnosis.