Donald Trump is sending a message to anyone hoping to work with his second White House: Dissenters need not apply. In a rapid-fire series of edicts and late-night social media posts over the last 72 hours, Trump made clear to Washington he plans to stack his second administration with loyalists and expects Republicans on Capitol Hill and elsewhere to fall in line. The incoming president on Monday tapped three of his staunchest current and former congressional allies for key roles, naming...