A dozen House Democrats sued Immigration and Customs Enforcement and the Department of Homeland Security for failing to admit Congress members to carry out oversight of federal immigrant detention facilities.

Rep. Joe Neguse (D-CO), House assistant minority leader, and 11 Democrats represented by Democracy Forward sued ICE on Wednesday, alleging the Trump administration blocked the lawmakers from carrying out their constitutional duty of conducting oversight of the executive branch. The lawsuit names ICE, ICE official Todd Lyons, DHS, and DHS Secretary Kristi Noem as the defendants.

“Blocking Members of Congress from oversight visits to ICE facilities that house or otherwise detain immigrants clearly violates federal law — and the Trump administration knows it,” Neguse said in a statement. “Such blatant disregard for both the law and the constitutional order by the Trump administration warrants a serious and decisive response.”