Sen. John McCain has been diagnosed with a brain tumor.
Staff at the Mayo Clinic Hospital in Phoenix says surgery McCain underwent to remove a blood clot above his left eye was associated with a tumor known as glioblastoma.
McCain is recovering from the surgery well, according to doctors and he and his family are looking at treatment options, including chemotherapy and radiation.
Glioblastoma is an aggressive tumor that forms in the tissue of the brain or spinal cord.
Doctors discovered the clot during a routine exam last week. The doctors told CNN that McCain, who has a history of skin, gets skin checks every four months as routine. He also complained of feeling foggy, not as sharp as normal, and he also had intermittent double vision.
McCain is currently resting at home.
McCain, 80, is a legendary politician. A son and grandson of four-star admirals, McCain served in the Vietnam War as a navel pilot. He was shot down over Hanoi in 1967, taken prisoner by the North Vietnamese and tortured in the infamous "Hanoi Hilton." He was released in March 1973.
McCain was elected to the U.S. House in 1982, and the Senate in 1986. While he is a conservative Republican, McCain has been known to be a "maverick" who would break with Republicans over policy from time to time.
McCain ran for president twice -- in 2000 against President George W. Bush in the Republican primary, and in 2008 as the party's nominee.
Best wishes for Sen. McCain from across the political spectrum
Concern for McCain has poured in from across the internet and across the aisle.
McCain's daughter, conservative Fox News host Meghan McCain, issued this statement:
Statement regarding my father @SenJohnMcCain: pic.twitter.com/SMte9Hkwkq
— Meghan McCain (@MeghanMcCain) July 20, 2017
The White House issued this statement on behalf of President Trump Wednesday evening:
"Senator John McCain has always been a fighter. Melania and I send our thoughts and prayers to Senator McCain, Cindy, and their entire family. Get well soon."
Florida's Republican Sen. Marco Rubio also tweeted for McCain:
.@SenJohnMcCain is an American hero. I pray for him and his family. I look forward to seeing him soon.
— Marco Rubio (@marcorubio) July 20, 2017
Also tweeting support for McCain was Rep. Steve Scalise, the House Majority Whip who is still recovering from being shot last month:
Praying for my friend @SenJohnMcCain, one of the toughest people I know.
— Rep. Steve Scalise (@SteveScalise) July 20, 2017
Former President Barack Obama, who ran against McCain in 2008, also tweeted his support:
John McCain is an American hero & one of the bravest fighters I've ever known. Cancer doesn't know what it's up against. Give it hell, John.
— Barack Obama (@BarackObama) July 20, 2017
Former Sen. and Secretary of State Hillary Clinton also tweeted her support:
John McCain is as tough as they come. Thinking of John, Cindy, their wonderful children, & their whole family tonight.
— Hillary Clinton (@HillaryClinton) July 20, 2017
This is a developing story. Check back for the latest.