FILE - In this March 31, 2017 file photo, Columbus Elementary School students walk towards the U.S. port of entry on the border with Puerto Palomas, Mexico, after attending school in Columbus, New Mexico. President Donald Trump is not giving up on his demands for $5.7 billion to build a wall along the U.S.-Mexico border, saying a physical barrier is central to any strategy for addressing the security and humanitarian crisis at the southern border. Democrats argue that funding the construction of a steel barrier along roughly 234 miles will not solve the problems. (AP Photo/Rodrigo Abd, File)