A Secret Service officer assigned to the White House was sentenced to 20 years in prison Thursday for sexting with minors and sending several underage girls sexually explicit images.

Lee Robert Moore, of Church Hill, Maryland, must also register as a sex offender and will be on supervised release for the remainder of his life, the Justice Department announced.

Moore, 38, pleaded guilty to enticing a minor to engage in sexual activity and attempting to send obscene materials to a minor in March. He worked for the Secret Service Uniformed Division and was assigned to the White House, where he sexted with the underage girls while on duty.