President Trump said Monday he hopes Sen. John McCain gets better soon after undergoing surgery because "we need his vote" to pass the Republican healthcare bill.

"I can tell you, we hope John McCain gets better very soon because we miss him. He's a crusty voice in Washington, plus we need his vote," Trump said at the White House.

McCain's office said the Arizona Republican underwent a surgical procedure to remove a blood clot from behind his eyebrow over the weekend. Senate Majority Leader Mitch McConnell said he was delaying consideration of the GOP healthcare bill until McCain gets back to work. For the Senate Republican bill to pass, McConnell, R-Ky., cannot lose more than three Republican senators.

"He will be back sooner than somebody else would be back, he'll be back soon. But we need that vote, and we need a number of votes, because do we have to repeal Obamacare, and we will end up replacing it with something that is going to be outstanding," Trump said.