Even without McCain's vote, Senate Republicans would have a thin majority of votes to pass the bill.
FILE - In this October 30, 20087 file photo, Republican presidential candidate Sen.
President TrumpDonald John TrumpHouse Democrat slams Donald Trump Jr. for "serious case of amnesia" after testimony Skier Lindsey Vonn: I don't want to represent Trump at Olympics Poll: 4 in 10 Republicans think senior Trump advisers had improper dealings with Russia MORE said Sunday he believes McCain would return to Washington if Republicans needed his vote. Bob Corker dissented. Corker said earlier this week that he would support the final version of the bill, that has been rewritten in conference with House and Senate members.
Republican Sen. John McCain is returning to Arizona after spending several days in a Maryland hospital recovering from side effects from chemotherapy treatment for brain cancer, CBS News has learned. "The senator has been through a round of chemo and he was hospitalized this week at Walter Reed". "The truth is that as anyone knows whose family has battled cancer or any significant disease that oftentimes there are side effects of treatment that you have", he said.
"Thank you to everyone for their kind words", she wrote.
McCain, who is in his sixth term as one of Arizona's senators, had surgery in July to remove a blood clot from above his left eye. Thad Cochran, R-Miss., missed votes last week. As a backstop, Vice President Mike Pence would be available to break a tie.
The Republican senator was admitted into the hospital on Wednesday after missing a third straight day of votes in the Senate.
In a dramatic turn, he cast a deciding vote against the Republican health care bill - a move that drew the wrath of Trump and conservatives.
The sources described McCain as looking increasingly frail and said he has not spoken up in recent GOP meetings the way he had before, in addition to his absence this week for treatment at Walter Reed Medical Center.
But McCain's condition has appeared to worsen lately. He suffered a minor tear in his right Achilles tendon, forcing him to wear a walking brace.
As a Navy pilot, McCain lived through a July 1967 fire that killed 134 sailors aboard the aircraft carrier USS Forrestal in the Gulf of Tonkin during the Vietnam War. He spent 2 of those years in solitary confinement also being tortured.