Attorney General Eric Holder Jr. proposed one of the largest overhauls of the country’s criminal legal system on Monday, pushing for “sweeping, systemic changes” in sentencing that could become a centerpiece of his tenure in the Department of Justice.

During an address to the American Bar Association, Holder announced a major policy shift within the U.S. Department of Justice policies and promoted legislation aimed at ending incarceration rates that he called “both ineffective and unsustainable.”