Wiser about the use of power, the newly sworn-in president suggests that this time he will not take no for an answer, whether ...

President-elect Donald J. Trump has made big promises on Ukraine, Iran, China and crises around the globe. But he will have ...

David E. Sanger is a national security correspondent and senior writer for the New York Times, a contributor to CNN and an adjunct lecturer at the Kennedy School of Government. In a 38-year ...