The 12 Democrats accused the Trump administration of violating the law when it turned them away from immigrant detention sites and imposed a new policy limiting congressional access.

But the Department of Homeland Security, which oversees ICE, recently imposed new restrictions that require a week’s notice for visits. The limits also exempt ICE field offices from oversight law, even though some immigrants have been detained in those facilities, according to the Times.

Twelve Democratic members of Congress sued the Trump administration on Wednesday, accusing immigration officials of blocking their access to detention facilities housing noncitizens.