Barack Obama tweets statement on John McCain's cancer diagnosis

Former President Barack Obama issued a quick message on Twitter after news broke that U.S. Senator John McCain was diagnosed with a brain tumor.

John McCain is an American hero & one of the bravest fighters I've ever known. Cancer doesn't know what it's up against. Give it hell, John.
— Barack Obama (@BarackObama) July 20, 2017

Obama and McCain were opponents during the 2008 presidential election. The two were also colleagues in the Senate.

Breaking News: John McCain has brain tumor removed

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Other statements of support were issued throughout the night by the White House and his colleagues as well as former president Bill Clinton and House Speaker Paul Ryan.

Statement from @POTUS on @SenJohnMcCain pic.twitter.com/OtdIDZTalz
— Sean Spicer (@PressSec) July 20, 2017

Karen & I are praying for @SenJohnMcCain. Cancer picked on the wrong guy. John McCain is a fighter & he'll win this fight too. God bless!
— Vice President Pence (@VP) July 20, 2017

"There is no one tougher": Reaction pours in from Sen. John McCain's colleagues following his brain cancer diagnosis https://t.co/iy0vZAwxkT pic.twitter.com/XoMMaCj1ZG
— CBS News (@CBSNews) July 20, 2017

Praying for my friend @SenJohnMcCain, one of the toughest people I know.
— Rep. Steve Scalise (@SteveScalise) July 20, 2017

John McCain is an American hero and a relentless fighter. I wish him Godspeed in this fight and look fwd to welcoming him back to work soon.
— Ben Sasse (@BenSasse) July 20, 2017

John McCain is an American hero and one of the greatest Americans of my generation. He, Cindy and their family are in my prayers.
— Johnny Isakson (@SenatorIsakson) July 20, 2017

.@SenJohnMcCain has always been a warrior. It's who he is. All of us, not as Republicans or Democrats, but as Americans, are behind him. pic.twitter.com/B6iDpPultM
— Paul Ryan (@SpeakerRyan) July 20, 2017

As he’s shown his entire life, don’t bet against John McCain. Best wishes to him for a swift recovery.
— Bill Clinton (@billclinton) July 20, 2017