Sen. Patrick Leahy Patrick Joseph LeahyBattle over timing complicates Democratic shutdown strategy Hillicon Valley: Russia 'amplifying' concerns around mail-in voting to undermine election | Facebook and Twitter take steps to limit Trump remarks on voting | Facebook to block political ads ahead of election Top Democrats press Trump to sanction Russian individuals over 2020 election interference efforts MORE (D-Vt.) chided Environmental Protection Agency (EPA) Administrator Scott Pruitt Edward (Scott) Scott PruittJuan Williams: Swamp creature at the White House Science protections must be enforceable Conspicuous by their absence from the Republican Convention 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."

“What a silly reason you had to fly first class, because of a danger to you, unless you flew first class,” Leahy told Pruitt at a Senate Appropriations Committee hearing for the EPA. “Nobody even knows who you are.”

“Oh, somebody might criticize you? You got security people that we’ve never seen before. But you have to fly first-class?" Leahy continued. "Oh, come on.”

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Pruitt has come under fire for a number of questionable expenses and arrangements in recent months. Politico reported in March that the EPA administrator had spent more than $105,000 on first-class flights, in addition to $58,000 spent to charter private and military planes.

The EPA has said that the first-class flights were necessary, because of security threats against Pruitt.

In a memo obtained by The Washington Post last week, the head of Pruitt's security detail requested business or first-class seating for the administrator, because of passengers "lashing out" at Pruitt when he was seated in coach.

"We believe that the continued use of coach seats for the Administrator would endanger his life and therefore respectfully ask that he be placed in either business or first class accommodations," the memo, dated May 1, 2017, reads.