With apologies for something obvious here, but it is direcly out of Wikipedia and I am just giving the direct quotes:
"On May 18, 2007, during a meeting to negotiate immigration legislation, McCain swore at fellow Senator John Cornyn (R-Texas) after Cornyn expressed concerns about the number of appeals that illegal immigrants could receive. According to multiple sources, Cornyn told McCain, "Wait a second here. I've been sitting in here for all of these negotiations and you just parachute in here on the last day. You're out of line," to which McCain replied, "Fuck you! I know more about this than anyone else in the room."[221][222]" Folks, I tell you, this man is dangerous and his agenda must be stopped. Let him run as a liberal independent if he wants, not as the GOP standard bearer.