FILE - Environmental Protection Agency Administrator Michael Regan speaks at the University of Maryland, May 11, 2023, in College Park, Md. (AP Photo/Nathan Howard, File)

FILE - EPA Administrator Michael Regan stands near the Marathon Petroleum Refinery as he conducts a television interview, while touring neighborhoods that abut the refinery, in Reserve, La., Nov. 16, 2021. (AP Photo/Gerald Herbert, File)

FILE - Environmental Protection Agency (EPA) Administrator Michael Regan speaks during an event, Dec. 20, 2021, outside the EPA Headquarters, in Washington. (AP Photo/Jacquelyn Martin, File )

FILE - Environmental Protection Agency Administrator Michael Regan speaks at Howard University, April 25, 2024, in Washington. (AP Photo/Kevin Wolf, File)

FILE - President Joe Biden speaks with Environmental Protection Agency administrator Michael Regan, left, in the Rose Garden of the White House in Washington, April 21, 2023. (AP Photo/Susan Walsh, File)