LAREDO, Texas -- The white tents that sit here on the very edge of the U.S border, with Mexico a literal stone’s throw away, represent one of the jewels in the crown of the Trump administration’s recent efforts to get a grip on the immigration crisis. They are the temporary courtrooms set up as part of the Migrant Protection Protocols (MPP) -- known colloquially as the “Remain in Mexico” policy. That policy, established earlier this year, involves sending migrants who are trying to claim asylum back to Mexico during their proceedings -- instead of releasing them into the U.S. while...