Trump wants to cancel more funding during the shutdown. Courts have hampered his earlier efforts

Congress has the constitutional power of the purse, but President Donald Trump’s robust assertion of executive authority is testing even that basic tenet of U.S. democracy. States, cities, nonprofits and other groups have responded with more than 150 lawsuits accusing the Republican administration of an unlawful power grab. The court's conservative majority has been receptive at least in preliminary rulings to many emergency appeals from the administration.