Sen. John McCain is planning to return to the Senate soon, according to a report, while his daughter says her father is 'doing good' as he battles cancer.

McCain has been recuperating in Arizona from the effects of cancer treatment. He flew there in advance of the Senate's vote on a $1.5 trillion tax cut before Christmas.

South Carolina Sen. Lindsey Graham told CBS 'Face the Nation' on Sunday that McCain, 81, would be back at work this month.

'Senator McCain is in rehab. He's coming back in January, (and) we need his voice now more than ever,' Graham said.

Senator John McCain, a Republican from Arizona and chairman of the Senate Armed Services Committee, listens during a hearing in Washington, D.C., U.S., on Thursday, Nov. 30, 2017. His friend Sen. Lindsey Graham says he will be back in the Senate in January

McCain's daughter, Meghan McCain, said in a co-hosting appearance on ABC's 'The View' that McCain continues to do physical therapy.

He injured his Achilles tendon, and was hospitalized in Maryland with an infection before deciding to fly home to Arizona for the holidays.

He skipped the tax cut vote, with passed with support from 51 Republicans.

'I just got off the phone with my father: 'Do your physical therapy,'" his daughter said. 'We were on the phone. He's with his physical therapist right now. They're still in Sedona.'

Sen. John McCain (R-AZ) arrives for work on Capitol Hill hours after voting NO on the GOP 'Skinny Repeal' health care bill, on July 28, 2017 in Washington, DC

Sen. John McCain, R-Ariz., is seen in the senate subway before a vote in the Capitol on December 6, 2017

Sen. Lindsey Graham predicted 2018 could be a year of 'extreme danger,' pointing to the country's two biggest threats: North Korea and Iran

'We had a good time just cooking and hanging out,' she said of the family holiday visit, azcentral reported.

CNN cited sources close to the senator saying he would return soon.

Word McCain would come to Washington came on a day of another major development about the composition of the Senate. Longtime colleague Utah Republican Senator Orrin Hatch announced Tuesday he would retire at the end of his term.

That opens up a chance for former McCain GOP presidential rival Mitt Romney to run for the Senate from Utah, where he owns a home.