WASHINGTON (AP) — Republican Sen. John McCain, who has spent the congressional recess undergoing treatment for brain cancer, is capping a busy summer of interviews, an Arizona Diamondbacks baseball game and family hikes with a trip to an international forum in Italy.

McCain, who turned 81 this past week, will speak Saturday at the Ambrosetti Forum in Cernobbio in northern Italy, joining Director of National Intelligence Dan Coats and Sen. Lindsey Graham, R-S.C., at a panel focused on the United States.

The chairman of the Senate Armed Services Committee will thank the Italian government and its people for their contribution to global security, including in Iraq, Afghanistan and Kosovo as well as Italy's role in fight Islamic State militants, especially in Libya, according to his office.

The six-term senator has been receiving radiation and chemotherapy for cancer at the Mayo Clinic in Phoenix. His office said the forum would be his first trip overseas this August recess.

McCain underwent surgery in mid-July to remove a 2-inch blood clot in his brain. He announced shortly thereafter that he had been diagnosed with an aggressive tumor called a glioblastoma.

In a dramatic turn, McCain returned to the Senate where he cast a deciding vote against the Republican health care bill, drawing the wrath of President Donald Trump and conservatives. McCain's vote scuttled the seven-year effort by the GOP to dismantle much of President Barack Obama's health care law.

McCain's office has said the senator will be back in Washington next week when lawmakers return from their break. The senator will be shepherding the annual defense policy bill.