The Environmental Protection Agency's inspector general is opening an investigation into Administrator Scott Pruitt's use of multiple email accounts.
Udall then pointed to an internal email from Pruitt's former security chief that contradicts Pruitt's testimony.
Pruitt later promoted Perrotta to lead his personal protective detail.
Prior EPA administrators have not had blanket protection.
Under sharp questioning by Sen.
In response, the committee's top Democrat, Sen.
Pruitt replied that the "policies were followed to the best of my knowledge by each of the agents that serve me".
At one of the House hearings last month, Pruitt spoke broadly of taking responsibility for changes at his agency, and said he had "made changes" in his practice of first- and business-class travel.
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Despite the mounting investigations, President Donald Trump has said he supports Pruitt.
A House committee and the Government Accountability Office also are investigating Pruitt.
"I'm being asked, really constantly asked, to comment on security and on housing and on travel".
EPA's inspector general revealed earlier this week that Pruitt requested and received 24-hour security beginning his first day in office.
During hearings last month, Pruitt, who was confirmed February 17, 2017, justified his security spending by citing threats he had received since taking office.
Pruitt isn't answering directly. "The possibility of committing perjury could make even Pruitt think twice before giving false statements to Congress again". The senior senator called "silly" Pruitt's claims he needed to fly in first class after unpleasant interactions with other travelers. Interior to use drones to fight wildfires EPA watchdog announces new probe into Pruitt's emails House lawmakers vote to give modest budget cuts to EPA, Interior MORE on Wednesday for racking up more than $100,000 in expenses on first-class flights, telling him that "nobody even knows who you are".
"We have to determine whether we have sufficient resources-people, time and funds-to do a project in a timely fashion and whether it would preclude our doing other crucial work", wrote Arthur Elkins Jr.
The EPA chief, ringed by his aides and security personnel, appeared to ignore them.