RICHMOND — Virginia Gov. Terry McAuliffe is considering expanding health coverage for the poor without the approval of the state legislature, a move that would muscle his top priority past Republican opponents but also throw his young administration into a partisan firestorm and uncertain legal territory. McAuliffe and his top advisers have consulted lawyers, health-care experts and legislators on how to bypass the GOP-dominated House of Delegates, according to three people familiar with the discussions. A fourth, who like the others spoke on the condition of anonymity because they were not authorized to reveal private strategy, said the office of...