WASHINGTON, DC - FEBRUARY 21: Environmental Protection Agency Administrator Scott Pruitt address employees at the agency's headquarters February 21, 2017 in Washington, DC. Pruitt, long a critic of the EPA, faced a contentious confirmation fight in the Senate. (Photo by Aaron P. Bernstein/Getty Images)

WASHINGTON, DC - FEBRUARY 21: Environmental Protection Agency Administrator Scott Pruitt address employees at the agency's headquarters February 21, 2017 in Washington, DC. Pruitt, long a critic of the EPA, faced a contentious confirmation fight in the Senate. (Photo by Aaron P. Bernstein/Getty Images)