Arizona Sen. John McCain underwent surgery at the Mayo Clinic in Phoenix on Sunday to treat an intestinal infection related to diverticulitis.
He is in stable condition, according to a statement released to the media from his Senate office.
McCain has largely worked out of his home in Cornville as he recovers from the side effects of ongoing cancer treatment and continues to serve as the chairman of the Senate Armed Services Committee.
“Senator McCain and his family are grateful to the senator’s excellent care team, and appreciate the support and prayers they continue to receive from people all over the country," the statement reads.
"He has remained engaged on his work as chairman of the Senate Armed Services Committee, and has enjoyed frequent visits from his family, friends, staff and Senate colleagues."
The 81-year-old Republican was diagnosed with glioblastoma, an aggressive brain cancer, in July 2017 while undergoing a procedure to remove a blood clot at the Mayo Clinic in Phoenix.
About 20,000 people in the United States each year are diagnosed with glioblastoma. The American Cancer Society puts the five-year survival rate for patients over 55 at about 4 percent.
McCain’s Mayo Clinic care team declined to be interviewed about the senator's health.