Mr. Trump urged uniformed sailors aboard the aircraft carrier Gerald R. Ford to call their members of Congress to lobby for his military spending plan and his proposed repeal of Mr. Obama’s health care program. Traditionally, the commander in chief does not tell the troops who serve under him to involve themselves in politics or policy battles on his behalf.
His comment to the sailors appeared to be ad-libbed, but still troubled security experts. “It was a mistake for the president to make this comment,” said Peter D. Feaver, a specialist on civilian-military matters at Duke University and a former national security aide to Mr. Bush. “While there is a legitimate role for senior brass to explain military affairs to the public, it is not good for civil-military relations to have the military viewed as a special interest group pleading for bigger budgets.”