WATCH: John McCain Arrives in Washington for Health Care Vote

Arizona Senator John McCain arrived in Washington, D.C. to vote on health care in the Senate. The 80-year-old Vietnam War veteran was diagnosed with a brain tumor last week. McCain arrived vote yes to hold a debate on the health care law.

When McCain later put in his “aye” vote to support debate, his Senate colleagues gave him a standing ovation.

McCain then delivered a speech, and was the first to speak after Vice President Mike Pence put in a tie-breaking vote so the Senate could start the debate. McCain has a scar over his left eye, were he had surgery to remove a blood clot.

McCain’s office announced late on Monday that he would be returning to the Senate after recovering in Arizona. “Senator McCain looks forward to returning to the United States Senate tomorrow to continue working on important legislation, including health care reform, the National Defense Authorization Act, and new sanctions on Russia, Iran and North Korea,” his office said in a statement.

“Look forward to returning to Senate tomorrow to continue work on health care reform, defense bill & #RussiaSanctions,” McCain tweeted on July 24.

McCain’s office announced on July 19 that his doctors discovered a brain tumor while he was undergoing a procedure to remove a blood clot above his left eye at the Phoenix Mayo Clinic Hospital. Testing revealed that he had a primary brain tumor known as glioblastoma.

“The Senator and his family are reviewing further treatment options with his Mayo Clinic care team. Treatment options may include a combination of chemotherapy and radiation,” the July 19 statement read. “The Senator’s doctors say he is recovering from his surgery ‘amazingly well’ and his underlying health is excellent.”

McCain’s health concerns followed his strange line of questioning of former FBI Director James Comey last month. McCain later blamed his confusing questions on staying up too late to watch a baseball game.

McCain was elected to a new term in November after talk about him possibly retiring. The 2008 Republican presidential candidate was first elected to the Senate in 1986. He is a Vietnam War veteran, and was held captive by the North Vietnamese. He also successfully fought melanoma, a form of skin cancer.