File photo taken on Feb. 15, 2016 shows a migrant touching hands of a beloved at the border between Mexico and the United States in Anapra, Chihuahua state, Mexico. On Jan. 25, 2017, U.S. President Donald Trump signed an executive order for the wall to be built, but Center for Latin American Monetary Studies (CEMLA) estimated that migration from Mexico has been slowing down since 2008 after growing from 1990 to its peak in 2007. (Xinhua/Guillermo Arias)