Rep. Keith Ellison (D-Minn.) on Tuesday criticized 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.) for casting a vote to advance an ObamaCare repeal bill despite his recent brain cancer diagnosis, asking how many others with the same affliction could soon lose their healthcare coverage.

“[Eighty thousand] a year get a diagnosis of brain cancer. How many won't be insured after this vote, next vote? I know of one who will be insured,” Ellison, the deputy chairman of the Democratic National Committee, tweeted.

80,000 a year get a diagnosis of brain cancer. How many won't be insured after this vote, next vote? I know of one who will be insured — Rep. Keith Ellison (@keithellison) July 25, 2017

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McCain dramatically returned to the Capitol on Tuesday, just days after announcing he has brain cancer, to vote in favor of advancing the GOP's ObamaCare repeal bill. Hours later, he voted yes on a final vote for the bill, which failed 43-57 despite his support.

The Arizona senator was absent from Congress last week after surgery to remove a blood clot from above his left eye revealed a type of brain cancer.

In a floor speech after the first vote, McCain said he would oppose the legislation in its current form when it comes time for final passage and called it a “shell of a bill,” adding that the Senate Health Committee should hold hearings on the legislation.

A vote on an amendment that would repeal much of ObamaCare is expected Wednesday.