The large portable tents made by Eugene-based company Western Shelter Systems have been used for people displaced by hurricanes and earthquakes, fighting wildfires and potentially infected with Ebola. But today, Western Shelter tents are being put to a more controversial use in Tornillo, Texas: housing hundreds of teenagers and children who tried to illegally cross the Mexican border. The camp, which some have dubbed a “tent city,” was erected quickly this spring near the Rio Grande to help enforce President Donald Trump’s new “zero tolerance” immigration policy.