Mexico's president-elect Andrés Manuel López Obrador says Mexico should no longer do Washington’s “dirty work” by catching Central Americans “fleeing violence and misery.” (Henry Romero/Reuters) MEXICO CITY — Mexico’s incoming president, a relentless critic of the ruling elite, has voiced no objection to the free-trade deal its current government brokered with the United States.On security matters, President-elect Andrés Manuel López Obrador’s team says it wants a productive relationship with the Trump administration and . . .