According to The Corner, McCain dropped the F-Bomb to a Texas Senator who wasn't as enthused about the amnesty plan as millions of illegal immigrants and John McCain.

A witness claims that "What is missing is the fact McCain was criticizing Cornyn's very simple but important request - a request he had made for three months in meetings without McCain being present for the most part - that important enforcement provisions be included. McCain called his sensible request 'Chickensh*#" and dismissed it..."

More here.