Sen. John McCain underwent surgery at the Mayo Clinic in Phoenix to treat an intestinal infection, according to a statement from his office.

The infection was related to diverticulitis, the statement said.

The Arizona senator was diagnosed with brain cancer in July after undergoing treatment for a blood clot. 

“Over the last few months, Senator McCain has been participating in physical therapy at his home in Cornville, Arizona, as he recovers from the side effects of cancer treatment,” a statement from his office said.

McCain’s wife Cindy tweeted that she’s looking forward to his release from the hospital.

My husband @SenJohnMcCain is doing well after his surgery. Looking forward to getting back to Hidden Valley!

— Cindy McCain (@cindymccain) April 16, 2018

Daughter Meghan McCain touted his “grit and determination” as an inspiration to her.

My father @SenJohnMcCain is in stable condition – he continues to inspire me everyday with his intense grit and determination. Thank you to the doctors at Mayo Clinic in Phoenix and to everyone who is praying for him.

— Meghan McCain (@MeghanMcCain) April 16, 2018

Arizona’s junior Sen. Jeff Flake, who is retiring, also tweeted his support.

What a great family @SenJohnMcCain has https://t.co/vnH1mVOfHS

— Jeff Flake (@JeffFlake) April 17, 2018

Doctors not involved in McCain’s treatment told AZCentral that complications like the one the senator was treated for is common in people undergoing brain-cancer treatment.

“We are seeing diverticulitis in more and more brain cancer patients,” Nader Sanai, a neurosurgeon and director of Barrow Brain Tumor Research Institute, told the outlet.

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