US Republican Senator John McCain has been diagnosed with brain cancer and is reviewing treatment options, his office says.
The tumour was discovered during surgery to remove a blood clot from above his left eye, a statement said.
The 80-year-old senator is recovering at home in Arizona. His treatment could include a “combination of chemotherapy and radiation”.
A Vietnam veteran, Mr McCain spent more than five years as a prisoner of war.
The six-term senator and 2008 Republican presidential nominee underwent surgery at a clinic in Phoenix last Friday..
Tissue analysis revealed that a primary brain tumour known as a glioblastoma was associated with the clot.
“The senator’s doctors say he is recovering from his surgery ‘amazingly well’ and his underlying health is excellent,” the statement said.
His daughter, Meghan, spoke in a statement of her family’s “shock” at the news.
“It won’t surprise you to learn that in all of this, the one of us who is most confident and calm is my father,” said the 32-year-old’s statement.
“So he is meeting this challenge as he has every other. Cancer may afflict him in many ways: but it will not make him surrender. Nothing ever has.”