Senate Judiciary Chairman Arlen Spector (R-Pa.) explained why he lashed out at the Vice President in a letter on CNN's The Situation Room earlier today, and complained about Cheney's lobbying behind the scenes to stonewall Congressional inquiries into the NSA wiretapping program.
"This is nothing personal between Arlen Specter and Vice President Cheney," said Specter. "This is a matter of civil liberties, it's a matter of separation of power, and it's a matter of important congressional oversight - and so far we're not getting there - and that's why I prepared a fairly strong letter."
"A very strong letter," replied CNN's Wolf Blitzer.
More about Specter's letter can be found at this link.