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 strategist donates to Alabama Democrat Meghan McCain knocks Bannon: 'Who the hell are you' to criticize Romney? Dems demand Tillerson end State hiring freeze, consult with Congress 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 strategist donates to Alabama Democrat McConnell names Senate GOP tax conferees Brent Budowsky: A plea to Alabama voters MORE (R-Ky.) and Sen. John CornynJohn CornynMcConnell names Senate GOP tax conferees Air Force makes criminal reporting changes after Texas massacre We need a better pathway for allowing civilians to move guns across state lines MORE (Texas), the No. 2 Senate Republican.