The EPA says it has a “zero-tolerance policy for career bureaucrats unlawfully undermining, sabotaging, and undercutting the administration’s agenda.”

Trump officials have placed 139 employees who signed a letter of dissent protesting the Environmental Protection Agency’s current direction and policies on leave Thursday.

Two employees in the EPA’s Region 8 headquarters in Denver and one who works at the EPA’s National Enforcement Investigations Center in Lakewood are under investigation for signing the letter, said Kate Tribbett, vice president of the American Federation of Government Employees Local 3607, which represents Region 8 employees.