Washington (CNN) Sen. John McCain returned to Arizona Sunday to continue recovering from the side effects of chemotherapy for a brain tumor and will not be in Washington for the tax vote this week, two sources close to McCain confirmed to CNN.

McCain is unlikely to return to Washington this year, one of the sources said. But his ability to get on a plane to Arizona was a "good sign," a source said.

McCain left Walter Reed Medical Center "exhausted, but ok," a Republican close to him said.

McCain's daughter, Meghan McCain, confirmed that the senator would be in Arizona for Christmas.

"Thank you to everyone for their kind words. My father is doing well and we are all looking forward to spending Christmas together in Arizona," she tweeted Sunday afternoon.

Thank you to everyone for their kind words. My father is doing well and we are all looking forward to spending Christmas together in Arizona. If you're feeling charitable this Christmas @HeadfortheCure or @NBTStweets to help find a cure for brain cancer is what I recommend. ❤️ — Meghan McCain (@MeghanMcCain) December 17, 2017

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