On Wednesday, the Mayo Clinic confirmed that Sen. John McCain (R-AZ) had been diagnosed with a brain tumor known as primary glioblastoma.

As previously reported, McCain, 80, went to the Mayo Clinic Hospital in Phoenix days earlier for a routine checkup in which he mentioned feeling fatigued, foggy, and not as mentally acute as usual. He also reported experiencing bouts of double vision.

Doctors performed a CT scan and an MRI, which revealed a blood clot. Surgery to remove the clot confirmed an “aggressive” brain tumor associated with the clot had formed.

McCain underwent immediate surgery to completely remove the cancerous tissue. Scans afterward showed that it had been completely removed.

According to a statement from McCain’s office:

The Senator’s doctors say he is recovering from his surgery “amazingly well” and his underlying health is excellent.

The statement also reads that McCain will work with the Mayo Clinic to determine further treatment options, such as chemotherapy and radiation.

According to the American Cancer Society, 20,000 people are diagnosed with glioblastoma every year, the Associated Press reports.

There is no cure, and although cancer cells may not be visible, they can still be present, as the tumor can grow roots into normal brain tissue. The five-year survival rate for patients over 55 is 4 percent, according to the AP.

In light of the discovery, McCain’s family has spoken publicly about the diagnosis and how they will rally to support him.

In a heartfelt statement, his daughter, Meghan, said: “It won’t surprise you to learn that in all this, the one of us who is most confident and calm is my father.”

His wife, Cindy, has also commented on the news, writing that “we as a family will face the next hurdle together,” as she shared this heart-wrenching photo of their wedding day:

McCain is reportedly recovering at home in Arizona.

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