While a worried nation tries to make sense of Donald Trump’s spate of unqualified, extreme nominees, the president-elect is setting the stage for an even more alarming takeover: a vast, dangerous and unconstitutional expansion of presidential power. This agenda includes not just emasculating the Senate’s advice-and-consent role but also refusing to spend money that lawmakers have appropriated, curbing the independence of federal regulatory agencies and eviscerating the nonpartisan civil service.