This isn’t very presidential:

On Friday, during a back-room discussion on the new immigration-reform package, Sen. John McCain (R-Ariz) started shouting at Sen. John Cornyn (R-Texas), who dared to disagree with him on the legislation. Apparently, McCain accused Cornyn of raising petty objections, and Cornyn accused McCain of having dropped in without taking part in the negotiations. “F**k you! I know more about this than anyone else in the room,” McCain reportedly shouted. Paul Kane added that McCain also “used a curse word associated with chickens.”