The EPA has been a oondoggle since its inception, and has been weaponized by every democrat president in office, since.
Liberals believe the EPA belongs to them regardless of who occupies the White House.
Scotty Pruitt, as Trump's head of the EPA was doing a wonderful job taking a hatchet to the agency from within but in doing so, he violated the rule above and made liberals cry. So they ginned up corruption charges against him because Pruitt was spending congressionally appropriated EPA funds on frivolities instead of using this money to enforce job-killing environmental regulations. Always trying to please his enemies, Trump buckled and demanded Pruitt's resignation.
Trump had a great knack at firing the good people while those within his administration who were actively undermining him all got to keep their jobs.