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Sen. Deb Fischer said Thursday she is eager to work with President-elect Donald Trump's nominee for administrator of the Environmental Protection Agency to "roll back harmful rules and regulations" promulgated by the Obama administration.

Trump has chosen Scott Pruitt, a critic of climate change regulations, to head the agency, subject to Senate confirmation.

As Oklahoma's attorney general, Pruitt sued the EPA over its regulation of emissions from power plants.

Fischer said the federal agency has been engaged in "extreme overreach" and it's time to "return EPA to its intended mission of implementing laws, not creating new ones."

Responding to another Trump nomination during a telephone conference call from Washington, Fischer said she supports granting a waiver for retired Marine Gen. James Mattis to be considered as the president-elect's choice for secretary of defense.

Current law prohibits recently retired military officers from serving as the civilian head of the Department of Defense. The law erects a barrier of seven years; Mattis has been retired for four years.