Senate Majority Whip Dick Durbin (D-Ill.) called the excessive-spending scandal at the General Services Administration "absolutely outrageous."
"I'm glad that the GSA administrator left," he said Sunday on NBC's "Meet the Press."
House and Senate panels are slated to hold hearings on the more than $800,000 spent on a conference in Las Vegas that included a clown, mind reader and lavish dinners and receptions.
Durbin said the agency falls under his purview as chairman of the Senate Appropriations subcommittee on Financial Services and General Government.
In recent days, videos surfaced showing GSA employees mocking the spending and joking about not getting caught.
"That kind of misuse of taxpayers’ funds is totally unacceptable," he said.
GSA head Martha Johnson stepped down following the revelations in an inspector general's report, and two other top officials were fired.