Sen. John McCain diagnosed with brain tumor

McCain, 80, was found to have a brain tumor known as a glioblastoma after undergoing a procedure to remove a blood clot near his left eye, according to a statement from Mayo Clinic Hospital in Phoenix.
3:05 | 07/20/17

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Transcript for Sen. John McCain diagnosed with brain tumor
Thursday morning and so many well wishes going out to John McCain and we add ours. What a giant John McCain has been. The man so center of American life for more than 50 years, prisoner of war, elder statesman of the senate. He had been experiencing double vision. Difficult moments he had at the James Comey hearing but they removed a blood clot above his left eye and discovered the brain tumor. His wife posting this photo thanking people for their thoughts saying he is the toughest person I know. He is my hero. I love him with all my heart. Our congressional correspondent Mary Bruce has the latest and joins us from capitol hill. Good morning. Reporter: Good morning. A lot of heavy hears here this morning. John McCain is known in these halls as a fierce fighter. He's tough and this morning he's in the midst of a hard fight once again. This morning, a giant of the senate is battling brain cancer. Senator John McCain is recovering at home in Arizona. After having surgery last Friday to remove a blood clot above his left eye. Further tests his doctors say revealed a tumor which was removed. His office says the senator and his family are currently reviewing treatment options including radiation and chemotherapy. His doctor Meghan posting an emotional tribute online reading the one of us who is most confident and calm is my father. He is the toughest person I know. The cruelest enemy could not break him, the aggressions of political life could not bend him. Cancer may afrikt him in many ways but it will not make him surrender. Nothing ever has. The 0-year-old senator and former Republican presidential nominee is a fighter and an American hero. As a young man he spent 5 1/2 years as a prisoner of war in Vietnam enduring cruel treatment and harsh conditions. In recent years he's overcome melanoma and politically -- Does that set your hair on fire. Reporter: -- He's never been known to shy away from a fight. Maybe we ought to put perspective on this. Reporter: He delivered a blunt speech about health care last week. This is disgraceful. What I'm asking for is simple. If we're going to stay here to work then let's get some work done. Reporter: Late last night his close friend Lindsey graham told reporters McCain says he's been through worse. God knows how this ends not me but I do know this, this disease has never had any more worthy opponent. Reporter: An outpouring of support and encouragement. Former president Obama tweeting cancer doesn't know what it's up against. Give it hell, John. From president trump his thoughts and prayers and these words. Senator John McCain has always been a fighter. Get well soon. Now, no word yet on when McCain may be returning to Washington but told he's in good spirit answer when I've seen him recently he's seemed like husband usual self joking with us reporters and giving us plenty of grief. You can't overstate how beloved he is on both sides of the aisle. Thoughts and prayers of this whole building are with him this morning. Seeing it and feeling it, Mary Bruce, thanks very much.

This transcript has been automatically generated and may not be 100% accurate.

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