A coalition of conservation groups sued the Trump administration on Thursday, accusing the government of slashing protections for migratory birds.

At issue is the Migratory Bird Treaty Act, which the National Audubon Society and other plaintiffs say has been undermined. In the past, the act helped hold parties responsible for actions that killed or injured migratory birds.

But in December, the Trump administration said energy companies and other businesses that accidentally kill migratory birds will no longer be criminally prosecuted.