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 lambasts Trump over performance in Helsinki Trump stuns the world at Putin summit NY Daily News cover following Helsinki summit shows Trump shooting Uncle Sam 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 lambasts Trump over performance in Helsinki Overnight Defense: Washington reeling from Trump, Putin press conference Feehery: The long game MORE (R-Ky.) and Sen. John CornynJohn CornynMcConnell: Russians are not our friends Russians' indictment casts shadow ahead of Trump-Putin summit Top GOP senator: Trump should be 'clear-eyed' going into meeting with Putin MORE (Texas), the No. 2 Senate Republican.