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The Mayo Clinic said on Wednesday that it discovered a tumor behind Sen. John McCain's (R-Ariz.) eye when he underwent surgery to remove a blood clot.

Mayo completely resected the tumor “tissue of concern,” according to a statement from the clinic, and McCain, 80, is in “excellent” health. “The Senator's doctors say he is recovering from his surgery 'amazingly well' and his underlying health is excellent,” a statement read.

McCain's office released a statement through the clinic noting the senator's appreciation for the support he's received. “He is grateful to the doctors and staff at Mayo Clinic for their outstanding care, and is confident that any future treatment will be effective,” the statement read.

President Donald Trump reacted to the news with a statement on Wednesday:

Both McCain's daughter, Meghan, and former President Barack Obama publicly commented on the news as well:

Lab results from McCain's Friday surgery uncovered the tumor, termed a “glioblastoma.” According to CNN, McCain went to the Mayo Clinic in Phoenix on Friday, when he didn't feel mentally as sharp as usual. McCain had a CT scan and MRI, neither of which apparently revealed the tumor.

After talking with McCain's doctors, CNN's Chief Medical Correspondent Dr. Sanjay Gupta said the tumor was “very aggressive.” With treatment, 14 months is the typical prognosis for that type of tumor.