Congress will investigate the misuse of federal money by the General Services Administration that brought down the agency’s administrator and two of her senior deputies on Monday.

General Services Administration Administrator Martha N. Johnson speaks during a news conference to discuss the “If You See Something, Say Something” campaign at the Ronald Reagan Building and International Trade Center on Dec. 8, 2010, in Washington. (Brendan Smialowski/Getty Images)

GSA’s inspector general issued a scathing report Monday that detailed misuse of funds and federal contracting violations over an $823,000 employee training conference GSA held in Las Vegas in October 2010.

“The Las Vegas fiasco is just the tip of the iceberg,” Mica said. He cited billions of dollars of misused funds and 14,000 vacant or underused buildings the government owns.

The public buildings subcommittee is chaired by Rep. Jeffrey Denham (R-Calif.).

Mica offered tepid praise of the Obama administration for not obstructing the agency’s investigation and taking swift action when the revelations were made public.

A spokesperson for Rep. Elijah Cummings (D-Md.), ranking member of the House Committee on Oversight and Government Reform said, “The current Administration took immediate action against those accused and asked for Johnson’s resignation although she was not directly involved in the scandal.”