Washington ? Senators trying to broker a compromise on judicial filibusters said Sunday an agreement was possible ahead of a critical vote this week set by majority Republicans to break the logjam on President Bush’s nominees.

Two senators leading talks among the dozen or so lawmakers who could force a deal spoke of the chance of averting a showdown, with a meeting set for today.

But Sens. John McCain, R-Ariz., and Ben Nelson, D-Neb., said an agreement that would protect the rights of the minority party and prevent abuse of the filibuster was proving elusive.

“We’re having difficulty coming up with exact language which would portray that desire. It’s tough,” McCain told “Fox News Sunday.”

Nelson, on CNN’s “Late Edition,” added: “It’s very hard to handicap it at this point in time. But we’ll certainly know tomorrow evening” after the meeting.

While wishing that group well, leaders from both parties predicted victory should senators end up voting on the change in procedures, which has come to be known as the “nuclear option.”

“The contempt for the rule of law and the law of rules will set a new precedent – an illegal precedent,” Senate Democratic leader Harry Reid of Nevada told new graduates of George Washington law school, his alma mater.

“If a compromise cannot be reached, Democrats and responsible Republicans will cast a historic vote for the Constitution and against the nuclear option,” Reid said.

Senate Minority Leader Harry Reid, D-Nev., receives an honorary Doctor of Law degree during a commencement ceremony Sunday at The George Washington University Law School in Washington. While delivering the commencement speech, Reid spoke about judicial filibusters.

Sen. Mitch McConnell, the Republicans’ vote-counter, said Majority Leader Bill Frist, R-Tenn., would have enough votes to stop a filibuster of the nomination of Texas Supreme Court Justice Priscilla Owen.

“If Senator Frist has to exercise (that) option, I believe we’ll have the votes,” McConnell, R-Ky., said on CBS’s “Face the Nation.”

In the shadow of the next Supreme Court vacancy and the 2008 presidential election, the debate over Bush’s judicial nominees has become a fight over the filibuster, a Senate tradition that allows members to hold up legislative business with unlimited talk. Bitterness has festered for years over what both sides say is abuse by the other of that parliamentary tool.

Frist, like McCain a possible presidential contender, has given Democrats an ultimatum: Stand aside and allow an up-or-down vote on Bush’s nominees, or prepare for an end to filibusters on judicial nominees.

Frist’s timetable calls for the critical votes to be cast Tuesday and Wednesday.

Democrats have refused to comply, insisting that the filibuster be preserved as a check on the rights of the Senate minority.

Senate Republicans gained four seats in the November elections, bringing the vote split to 55 Republicans, 44 Democrats and one independent. Under parliamentary procedures, 60 votes are needed to end a filibuster and go to a vote.

Six senators from each party are needed to force a deal whereby future judicial nominees are not blocked and current filibuster procedures remain unchanged.