Donald Trump will be sworn in as US president on Monday, ushering in another turbulent four-year term with promises to push the limits of executive power, deport millions of immigrants, secure retribution against his political enemies and transform the role of the US on the world stage.Even before Trump was to take office at noon ET (1700 GMT), aides detailed a raft of executive actions that he will sign immediately, including 10 focused on border security and immigration, his top priority.The president will declare a national emergency at the southern border, send armed troops there and resume a policy forcing asylum seekers to wait in Mexico for their US court dates, an incoming White House official told reporters.For all the latest headlines follow our Google News channel online or via the app.The inauguration completes a triumphant comeback for a political disruptor who survived two impeachment trials, a felony conviction, two assassination attempts and an indictment for attempting