WASHINGTON (AP) _ Sen. Strom Thurmond of South Carolina, the nation's longest-serving senator, collapsed Tuesday on the Senate floor. His condition was not immediately known.

The Senate chamber was then cleared at the order of Senate Majority Leader Thomas Daschle, D-S.D.

Among the senators near Thurmond when he collapsed was Sen. Bill Frist, R-Tenn., a physician. Thurmond, 98, is a Republican.