The General Services Administration has placed an eighth employee on leave after an investigation into a lavish 2010 training conference in Las Vegas.

The GSA has been under fire from Congress for spending more than $820,000 of taxpayers' money on that conference, which included mind readers and party clowns.

Three congressional committees are set to hold hearings about the agency's wasteful spending next week.

But the GSA maintains that, "the actions of the Western Regions Conference are not consistent with how GSA conducts business."