UPDATE 2-Pentagon eyes longer-term support on U.S.-Mexico border

Acting U.S. Defense Secretary Patrick Shanahan made his second trip to the U.S.-Mexico border on Saturday as the Pentagon looks to develop a longer-term plan to support President Donald Trump's immigration policies.Shanahan traveled to McAllen, Texas, to meet with officials and visit a migrant processing facility and Border Patrol station, two days after the White House announced Trump's intention to nominate the former Boeing Co executive as defense secretary."We're not going to leave until the