WASHINGTON (AP) - House negotiators have agreed to a Senate demand to include money laundering legislation in President Bush's anti-terrorism package, clearing the last major hurdle to passage, senators said Thursday.

The Senate and House probably will take up the compromise early next week after aides draft the final version over the weekend, said Sen. Patrick Leahy, the Senate Judiciary Committee chairman.

Negotiators agreed Wednesday to end after four years the new wiretapping, electronic surveillance and secret search portion of the legislation, the most contested part of the package. With the agreement to include money laundering, the most difficult negotiations were over, Leahy said.

"We've just got to work out the details over the weekend," he said. Work that normally could take a day now requires more time because of the shutdown of the House and Senate office buildings for anthrax testing, Leahy said.

House and Senate members have not decided on the final version of the money laundering plan.

The House Financial Services Committee chairman, GOP Rep. Michael Oxley of Ohio, and Maryland Sen. Paul Sarbanes, the Senate Banking Committee chairman, have been working on a compromise on the money laundering language.

The top Republican on the Senate committee, Utah's Orrin Hatch, said that the final package will include money laundering language.

Both the House and Senate versions are intended to fight money laundering around the world, thwart the financing of terrorism and protect the U.S. banking system from illicit money.

Both the House and Senate anti-terrorism measures would expand the FBI's wiretapping authority, impose stronger penalties on those who harbor or finance terrorists and increase punishment of terrorists.

House leaders insisted on changing the Senate package so the most intrusive of the new measures would expire after a certain period.

Senate leaders insisted on including the money laundering legislation because they feared the House would not pass such legislation that would be acceptable to senators.