Obama sends well wishes to McCain: 'Cancer doesn't know what it's up against'

Obama sends well wishes to McCain: 'Cancer doesn't know what it's up against'
© Twitter/Obama

Former President Obama on Wednesday sent well wishes to Sen. John McCainJohn Sidney McCainGOP senator says Republicans didn't control Senate when they held majority Pence met with silence after mentioning Trump in Munich speech Mark Kelly's campaign raises over M in days after launching Senate bid MORE (R-Ariz.) after it was announced that McCain has been diagnosed with brain cancer.

"John McCain is an American hero and one of the bravest fighters I've ever known. Cancer doesn't know what it's up against. Give it hell, John," Obama tweeted.

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Mayo Clinic Hospital in Phoenix announced McCain's diagnosis on Wednesday.

The tumor was discovered after the senior Arizona senator underwent a minor procedure last week to remove a blood clot from above his left eye. 

The news of McCain’s diagnosis prompted an immediate outpouring of support from fellow lawmakers, including Obama, Senate Majority Leader Mitch McConnellAddison (Mitch) Mitchell McConnellGOP Green New Deal stunt is a great deal for Democrats The national emergency will haunt Republicans come election season Trump: McConnell should keep Senate in session until nominees are approved MORE (R-Ky.) and Sen. John CornynJohn CornynOn unilateral executive action, Mitch McConnell was right — in 2014 Poll shows competitive matchup if O’Rourke ran for Senate again On The Money: Trump declares emergency at border | Braces for legal fight | Move divides GOP | Trump signs border deal to avoid shutdown | Winners, losers from spending fight | US, China trade talks to resume next week MORE (Texas), the No. 2 Senate Republican.