How could a president pass a law that is unconstitutional?

The president can issue rules, regulations, and instructions called executive orders, which have the binding force of law upon federal agencies but do not require approval of the United States Congress. ( i underlined the most important information)

Explanation:

I have reflected further on the difficult questions surrounding a President's decision to decline to execute statutory provisions that the President believes are unconstitutional, and I have a few thoughts to share with you. Let me start with a general proposition that I believe to be uncontroversial: there are circumstances in which the President may appropriately decline to enforce a statute that he views as unconstitutional.When the proper court determines that a legislative act (a law) conflicts with the constitution, it finds that law unconstitutional and declares it void in whole or in part. This is called judicial review. The Constitution is one source of law. When something is done in violation of the Constitution it is "unconstitutional". Legal vocabulary aside, that term means exactly what it says: contrary to the Constitution. Because the Constitution is a source of law, everything that is unconstitutional is also illegal. unconstitutional?: not according or consistent with the constitution of a body politic (such as a nation) an unconstitutional infringement on rights. there is significant judicial approval of this proposition. The President's office and authority are created and bounded by the Constitution; he is required to act within its terms. Put somewhat differently, in serving as the executive created by the Constitution, the President is required to act in accordance with the laws including the Constitution, which takes precedence over other forms of law. This obligation is reflected in the Take Care Clause and in the President's oath of office. When bills are under consideration by Congress, the executive branch should promptly identify unconstitutional provisions and communicate its concerns to Congress so that the provisions can be corrected. Although this may seem elementary, in practice there have been occasions in which the President has been presented with enrolled bills containing constitutional flaws that should have been corrected in the legislative process.   The President should presume that enactments are constitutional. There will be some occasions, however, when a statute appears to conflict with the Constitution. In such cases, the President can and should exercise his independent judgment to determine whether the statute is constitutional. In reaching a conclusion, the President should give great deference to the fact that Congress passed the statute and that Congress believed it was upholding its obligation to enact constitutional legislation. Where possible, the President should construe provisions to avoid constitutional problems.