Talk of trying to do away with filibuster rule has made Reid throw down the gauntlet.

USATODAY: GOP sets up Senate collision on judges

Senate Minority Leader Harry Reid, D-Nev., has vowed to tie the Senate into procedural knots if Frist tries to change the filibuster rule. "It will be very difficult to get even the most routine work done in the Senate," Reid spokesman Jim Manley said in an interview Sunday.