WASHINGTON — The senior military lawyer for the combatant command overseeing lethal strikes on alleged drug-smuggling boats near Venezuela disagreed with the Trump administration’s position that the operations are lawful — and his views were sidelined, according to six sources with knowledge of the legal advice. The lawyer, who serves as the senior judge advocate general, or JAG in military parlance, at U.S. Southern Command in Miami, raised his legal concerns in August before the strikes began