Abstract: Recent Presidents have claimed wide-ranging authority to decline enforcement of federal laws. The Obama Administration, for example, has announced policies of abstaining from investigation and prosecution of certain federal marijuana crimes, postponing enforcement of key provisions of the Affordable Care Act, and suspending enforcement of removal statutes against certain undocumented immigrants. While these examples highlight how exercises of executive enforcement discretion — the authority to turn a blind eye to legal violations — may effectively reshape federal policy, prior scholarship has offered no satisfactory account of the proper scope of, and constitutional basis for, this putative executive authority. This Article fills that gap.