Yet the last two weeks have tested the limits of the Democrats’ leverage, offering them bitter reminders that success for the minority party is relative, and often fleeting. On Sunday, Trump laid out a list of hard-line demands on immigration that seemed to extinguish hopes for a quick agreement to shield young undocumented immigrants from the threat of deportation. Then, on Monday, Scott Pruitt, the administrator of the . Environmental Protection Agency, announced that the EPA would fully repeal the Obama administration’s Clean Power Plan to combat climate change. And on Thursday, Trump signed an executive order that could ultimately destabilize Obamacare’s insurance markets and achieve at least part of the outcome Republicans failed to accomplish legislatively.