The director of Columbia Law School’s Immigrants’ Rights Clinic is set to testify Friday before a Congressional committee about the “urgent humanitarian crisis” she and fellow lawyers and doctors found last month when they visited a detention center packed with migrant children.

Elora Mukherjee, in 33 pages of prepared remarks to the U.S. House of Representatives Committee on Oversight and Reform on the Trump Administration’s child separation policy, provides an extraordinary perspective into the three days she and a small team of investigators spent in a detention facility in Clint, Texas, in mid-June.