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 McCainSenate's defense authorization would set cyber doctrine Senate Dems hold floor talk-a-thon against latest ObamaCare repeal bill Overnight Defense: Senate passes 0B defense bill | 3,000 US troops heading to Afghanistan | Two more Navy officials fired over ship collisions 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 McConnellSenate passes 0B defense bill Overnight Health Care: New GOP ObamaCare repeal bill gains momentum Overnight Finance: CBO to release limited analysis of ObamaCare repeal bill | DOJ investigates Equifax stock sales | House weighs tougher rules for banks dealing with North Korea MORE (R-Ky.) and Sen. John CornynJohn CornynNew GOP ObamaCare repeal bill gains momentum Week ahead: Senators near deal to stabilize ObamaCare markets GOP eying 'blue slip' break to help Trump fill the courts MORE (Texas), the No. 2 Senate Republican.