WASHINGTON (AP) — The Senate Judiciary Committee is demanding answers from federal immigration officials about the Trump administration’s separation of migrant children from their families and its struggle to reunite them, a fraught effort that’s drawn election-year criticism from both parties. But a hearing scheduled for today (Tuesday) on the topic, may have a wider focus after the committee’s bipartisan leaders asked federal investigators to probe reports of sexual and other abuse of immigrants at government detention facilities. Committee Chairman Chuck Grassley, R-Iowa, and top panel Democrat Dianne Feinstein of California asked late Monday for an examination of alleged sexual, physical and emotional mistreatment of immigrants held at agency facilities, saying the problems may have been occurring since 2014 or earlier. The AP reported last month that children held at an immigration detention facility in Roanoke, Virginia, said they were beaten while handcuffed, locked in solitary confinement and left nude and cold in concrete cells.

A civil rights lawsuit has been filed alleging mistreatment at the Shenandoah Valley Juvenile Center from 2015 to 2018. The alleged victims, Hispanic youths held for months or years, have submitted sworn statements in the case. Lawyers for the facility have denied the alleged abuse. Many of the children have been accused by immigration officials of belonging to MS-13 and other violent gangs, an activity Trump has used to justify his “zero tolerance” policy of prosecuting immigrants caught entering the country without permission.

Homeland Security spokeswoman Katie Waldman said agency officials perform their duties “professionally and humanely” and that the agency “is abiding by the intent and letter of law and maintains the highest standards care for individuals in our custody.”