Executive Orders are controversial because they allow the President to make major decisions, even law, without the consent of Congress. This, of course, runs against the general logic of the Constitution — that no one should have power to act unilaterally. Nevertheless, Congress often gives the President considerable leeway in implementing and administering federal law and programs. Sometimes, Congress cannot agree exactly how to implement a law or program. In effect, this leaves the decision to the federal agencies involved and the President that stands at their head. When Congress fails to spell out in detail how a law is to be executed, it leaves the door open for the President to provide those details in the form of Executive Orders.