Politicians across the board are voicing their support for Sen. John McCain, R-Ariz.
McCain announced Thursday he has been diagnosed with brain cancer. Doctors discovered a tumor after removing a blood clot above his eye.
Former President Barack Obama tweeted his support. He said McCain is "an American hero & one of the bravest fighters I've ever known." He told the veteran senator to "give it hell."
Sen. Elizabeth Warren, D-Mass., said "trust me, John's in fighting shape," recalling a trip she took with McCain to Pakistan and Afghanistan in early July.
Former Secretary of State Hillary Clinton also lent her support, saying in part that "John McCain is as tough as they come."
McCain doesn't know when he'll return to the Senate and is weighing options for further treatment.