U.S. Secretary of State Rex Tillerson(R), along with U.S. Secretary of Homeland Security John Kelly(L), attends a press conference in Mexico City, capital of Mexico, on Feb. 23, 2017. Top U.S. envoys on a working visit to Mexico on Thursday tried to allay fears that their government was preparing to massively deport undocumented migrants back across the border. (Xinhua/Francisco Canedo)