Sen. John McCain John Sidney McCainBiden's six best bets in 2016 Trump states Replacing Justice Ginsburg could depend on Arizona's next senator The Hill's Morning Report - Sponsored by Facebook - Washington on edge amid SCOTUS vacancy MORE (R-Ariz.) said Thursday that he doesn't like President Trump mocking him over his health-care vote but that there's nothing he can do about it.

"I regret that he's doing it, but there's nothing I can do about it," McCain said, asked by The Hill about Trump's actions.

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Trump is reportedly mocking McCain over his opposition to the Senate GOP's ObamaCare repeal legislation, including mimicking his dramatic thumbs down to the "skinny repeal" bill in July, according to Axios.

White House sources disputed that Trump physically mocked McCain in recent meetings, although the president did reportedly mention McCain’s “thumbs down” vote.

McCain added that he represents Arizona and "they know me."

"Those are the ones that I am representing and so, do I like it? No. But does it bother me? Not particularly," he said.

McCain, who has brain cancer, was one of three GOP senators who killed the ObamaCare repeal effort in July.

He also opposed legislation from GOP Sens. Lindsey Graham Lindsey Olin GrahamGraham: GOP will confirm Trump's Supreme Court nominee before the election Fox's Napolitano: Supreme Court confirmation hearings will be 'World War III of political battles' Grassley, Ernst pledge to 'evaluate' Trump's Supreme Court nominee MORE (S.C.) and Bill Cassidy William (Bill) Morgan CassidyCoushatta tribe begins long road to recovery after Hurricane Laura Senators offer disaster tax relief bill Bottom line MORE (La.) that would have replaced ObamaCare's Medicaid expansion and insurance subsidies with block grants to the states.

It's not the first time Trump has taken aim at McCain. Trump sparked bipartisan backlash after he mocked McCain's time as a prisoner of war in Vietnam.

"I like people who weren't captured," Trump said in 2015.

McCain recently noted that Trump never apologized for his comments.