Democrats Threaten to Stop Senate Business if GOP Changes Rules on Judge Confirmations By David Espo The Associated Press WASHINGTON (AP) - Democrats served notice Tuesday that they will slow or stop most Senate business if Republicans unilaterally change the rules to assure confirmation of President Bush's controversial court appointments. Any such change would mark "an unprecedented abuse of power," Sen. Harry Reid, D-Nev., wrote Majority Leader Bill Frist, R-Tenn. Reid, the Democratic leader, exempted military and national security legislation from the threat, and said Democrats would not block passage of measures needed to assure continuation of critical government services....