Describing the billions of dollars in contracts and services handled by the General Services Administration as a den of temptation, senators from both parties called Wednesday for the agency at the center of a spending scandal to clean house as it roots out corruption.

"The party's over," declared Democratic Sen. Barbara Boxer of California, chairwoman of the Senate Environment and Public Works Committee, at the third congressional hearing in three days on the controversy that has embarrassed the Obama administration in an election year.

Speaking to GSA Inspector General Brian Miller and Acting Administrator Dan Tangherlini, Boxer said the panel "will support you and encourage you to clean house" at the vast federal procurement agency.