President Trump Donald John TrumpUS reimposes UN sanctions on Iran amid increasing tensions Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Trump supporters chant 'Fill that seat' at North Carolina rally MORE on Friday called out Sen. John McCain John Sidney McCainMomentum growing among Republicans for Supreme Court vote before Election Day McConnell urges GOP senators to 'keep your powder dry' on Supreme Court vacancy McSally says current Senate should vote on Trump nominee MORE (R-Ariz.), though not by name, for his vote against ObamaCare repeal.

"Except for one senator, who came into a room at 3 o’clock in the morning and went like that, we would have had health care too, we would have had health care too, think of that," Trump told the Conservative Political Action Conference, imitating the thumbs down motion that McCain made during a late-night vote to pass a repeal measure.

President Trump appears to slam Sen. John McCain over 2017 health care vote: "I don't want to be controversial so I won't use his name. What a mess." https://t.co/LfZRkoMely pic.twitter.com/rlpcIeLSra — CBS News (@CBSNews) February 23, 2018

McCain's vote in July was one of three key votes against a slimmed-down repeal bill that helped doom the repeal-and-replace effort.

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Trump on Friday argued that despite McCain's vote, "we may be better off the way we’re doing it" — going after ObamaCare in a piece-by-piece way.

Trump has attacked McCain before, most prominently in 2015 over his service in the Vietnam War, where McCain was held as a prisoner of war, by saying, "I like people that weren't captured."