WASHINGTON (AP) _ The Clinton administration and Senate Democrats abandoned their opposition to a popular missile-defense bill Tuesday, agreeing to a compromise with Republicans designed to keep the system from interfering with arms-control efforts with Moscow.

The 99-0 acceptance of a proposal by Sens. Mary Landrieu, D-La., and Olympia Snowe, R-Maine, all but assured passage in the Senate of the overall measure that declares as U.S. policy deployment of a ballistic-missile defense as soon as ``technologically possible.''

A final vote is expected Wednesday on the overall bill.