President Obama's decision last week to suspend the employer mandate of the Affordable Care Act may be welcome relief to businesses affected by this provision, but it raises grave concerns about his understanding of the role of the executive in our system of government.

Article II, Section 3, of the Constitution states that the president "shall take Care that the Laws be faithfully executed." This is a duty, not a discretionary power. While the president does have substantial discretion about how to enforce a law,...