NEW: Botched family reunifications left migrant children waiting in vans overnight:

Not until after 2 nights in a van did the last child step out of a van to be reunited.

Most spent at least 23 hours in the vehicles. https://t.co/gRMKB7EmP3 - @JuliaEAinsley / @jacobsoboroff

— NBC Politics (@NBCPolitics) June 4, 2019