MEXICO CITY - Mexican President Andres Manuel Lopez Obrador is facing a barrage of criticism at home that he is doing U.S. President Donald Trump’s bidding after erecting a “wall” of security forces near the Guatemala border to keep out Central Americans. Mexico has bowed to demands from Trump, under the threat of punitive tariffs, to contain mass movements of migrants, most of them from Central America, who have been crossing through Mexico on their way to the U.S. border. Lopez Obrador was questioned at his daily morning news conference for a second day in a row about how the...