The Colorado attorney general is suing a sheriff's deputy for his role in the detention last month of a University of Utah student by federal immigration officials.

Colorado Attorney General Phil Weiser is suing a sheriff's deputy who Weiser says told ICE officials in an encrypted Signal chat to a woman who was allegedly in the U.S. on an expired visa, in violation of state law.

Phil Weiser lawsuit cites Colorado law limiting the authority of state agencies and employees to cooperate with federal immigration officials.