They had four minutes. On Saturday, Martin Giovanni Portillo proposed to his girlfriend, Daisy Arvizu, in front of family. But there was no time to spare. Standing in a dry riverbed of the Rio Grande on the US-Mexico border, Portillo, a US citizen, had to do it quickly. Every year, a nonprofit in El Paso, Texas, organizes a “Hugs Not Walls” event that allows families to temporarily reunite while US Border Patrol agents keep watch.