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Very difficult. There could be ways to limit them even further. Currently, they are prohibited from collective bargaining. And joining is not mandatory.

Trump could stop the federal government from facilitating dues collection thru the payroll process forcing the unions to collect dues thru a separate private system. There could be some limitations placed on their political activities. You can expect massive resistance by the unions and the Dems. It would be a bloody fight. How much political capital would Trump want to risk taking up this fight?