On Friday, Trump signed a number of executive orders directive federal agencies to fire low-performing workers and negotiate better agreements with labor unions. Moreover, he wants to significantly reduce the amount of time that federal employees can spend on union activities while working. Federal labor unions say that the move was politically motivated and meant to be an attack on the merit system. President of the American Federation of Government Employees, J. David Cox, said that the plan is meant to get rid of Federal employees who may hold political views that diverge from Trump's.
See "Trump signs executive orders aimed at loosening clout of federal labor unions", Gregory Korte, USA Today, May 25, 2018