Sen. John McCain has been diagnosed with brain cancer, according to a statement by his office.

The 80-year-old Arizona Republican went to the Mayo Clinic in Phoenix on Friday to have a blood clot removed above one of his eyes. That's when doctors found and removed a glioblastoma brain tumor.

According to Mayo Clinic, that's an aggressive form of cancer that can show up in the brain or spinal cord.

McCain is currently looking into further treatment options with Mayo.

In terms of his recent surgery, doctors say McCain is recovering "amazingly well."

The senator's daughter Meghan McCain tweeted out that the whole family is anxious about what's next.

"It won't surprise you to learn that in all this, the one of us who is most confident and calm is my father," she said.

In 2000, McCain had melanoma, a dangerous skin cancer.

https://twitter.com/MeghanMcCain/status/887826105352298496

https://twitter.com/BarackObama/status/887836712822558720

https://twitter.com/marcorubio/status/887833561767841792

https://twitter.com/HillaryClinton/status/887836701527355393