TOPSHOT - Central American migrants try to cross the Rio Bravo, from Piedras Negras, in Coahuila state, Mexico to the city of Eagle Pass, in Texas, US, as seen from Mexico on February 17, 2019. - Last week Trump invoked a "national emergency" to justify tapping military and other funds for barrier construction, after Congress approved less than a fourth the $5.7 billion he had sought for border security. A White House top adviser said Sunday that the president's emergency declaration could allow "hundreds of miles" of barriers to be built on the Mexican border before the 2020 election. (Photo by Julio Cesar AGUILAR / AFP) (Photo credit should read JULIO CESAR AGUILAR/AFP/Getty Images)
