Homeland Security’s internal watchdog warned of “dangerous overcrowding” at migrant prisons on the U.S. southern border. In a report released Thursday, inspectors said they saw 900 people jammed into facilities in El Paso, Texas, intended for a maximum capacity of 125 people. Some of the imprisoned migrants were forced to stand for days due to lack of space, while some had to stand on toilets to get breathing space. The report advised Customs and Border Protection to take “immediate steps” to remedy the situation. President Trump has sought to place blame for the increase in migrants on the Mexican government. On Thursday, he threatened to impose a 5% tariff on Mexican goods starting next week, until Mexico cracks down on Central American migrants heading for the U.S. border. The tariff would increase 5% every month until it hits 25%. Mexican officials are set to hold talks with the Trump administration this week.