US senator John McCain diagnosed with brain cancer
The malignant tumour was discovered last week during his surgery to remove a blood clot from above his left eye.
McCain is a six-term senator and the 2008 Republican Presidential candidate.
He underwent surgery on Friday at a facility in Phoenix, Arizona.
"The senator's doctors say he is recovering from his surgery 'amazingly well' and his underlying health is excellent," a statement from the clinic read.
"Treatment options may include a combination of chemotherapy and radiation," it added.
Calling him a 'fighter', US President Donald Trump tweeted: "Melania and I send our thoughts and prayers to Senator McCain, Cindy, and their entire family. Get well soon."
Former President Barack Obama hailed McCain as a hero.
"John McCain is an American hero & one of the bravest fighters I've ever known. Cancer doesn't know what it's up against. Give it hell, John," his tweet read.
McCain's daughter in a statement posted on Twitter said that the senator reacted in a calm and confident manner upon learning about his disease.
The Arizona senator is a Vietnam veteran and spent more than five years as a prisoner of war (POW).
Image: twitter.com/SenJohnMcCain
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