Border Patrol officials were on pace in March for more than 100,000 apprehensions and encounters with migrants – the highest monthly tally in over a decade, he said. Around 90 percent of those – or 90,000 – crossed the border between legal ports of entry. ... Increasingly, smugglers are bringing larger numbers of families together and delivering them across the Rio Grande, knowing they’ll overrun facilities and be released until their immigration court date, she said. Under U.S. law, Border Patrol is not supposed to hold any migrant for longer than 72 hours. Usually, Border Patrol hands them over to Immigration and Customs Enforcement, which can detain families for up to 20 days. But all of those facilities are overcrowded, [Theresa] Brown [of the Bipartisan Policy Center] said, leading Border Patrol to skip the transfer to ICE and release migrants to shelters en masse. “This is a system-wide collapse,” she said.