Acting Immigration and Customs Enforcement (ICE) Director Todd Lyons submitted his resignation letter to Department of Homeland Security (DHS) Secretary Markwayne Mullin on Thursday, with his departure set for May 31. Lyons described his tenure as “a privilege to serve under President Donald Trump” and stated he wishes to spend more time with his family.

In a statement, DHS Secretary Mullin praised Lyons as “a great leader of ICE and key player in helping the Trump administration remove murderers, rapists, pedophiles, terrorists, and gang members from American communities.” The statement noted that Lyons had jumpstarted an agency that had not been allowed to do its job for four years. “Thanks to his leadership, American communities are safer,” Mullin added. He also expressed confidence in Lyons’ next steps: “We wish him luck on his next opportunity in the private sector.”

Lyons has overseen roughly 584,000 ICE deportations since President Donald Trump was inaugurated for a second term last year. With more than two decades of service at ICE and previously serving in the U.S. Air Force special forces, Lyons is set to become the agency’s first unconfirmed director in nearly a decade.

The agency has not had a Senate-confirmed leader since the Obama administration. Earlier this week, Lyons testified before a House Appropriations subcommittee regarding the unprecedented number of deaths in ICE custody and plans for future detention facilities.