Trump’s incoming "border czar" is going on a warpath after liberal leaders began issuing warnings in recent days that they plan to defy mass deportation orders.

Mexican President Claudia Sheinbaum threatened to retaliate with her own tariffs against the United States, after President-elect Trump suggested he would impose a 25 percent tax on imported goods from Mexico if her country did not stop the flow of drugs across the border. In remarks on Tuesday, Sheinbaum said that drugs were a U.S.…