WASHINGTON (AP) — House Democrats voted to subpoena Trump administration officials over family separations at the southern border.

The subpoenas will be the first issued in the new Congress as House Democrats have promised to hold the administration aggressively to account.

The Oversight Committee voted Tuesday to compel the heads of Justice, Homeland Security and Health and Human Services to issue documents on family separations, including the age and gender of each child separated. Chairman Elijah Cummings says he’s been trying to get information for seven months and has received nothing.

More than 2,700 children were separated from their parents at the border last year. An internal watchdog report recently found that thousands more children than previously thought could have been separated.

Cummings said the separations were a “national emergency.”