Where in the Constitution does it say that the President can legislate?

[brucejoel99]

The President's legislative power springs primarily from Article I, Section 7, which states that "Every bill which shall have passed the House of Representatives and the Senate, shall, before it become a law, be presented to the President of the United States." If the President signs a bill, it becomes law. If not, it's returned to Congress, which can pass the bill over the President's objection by a 2/3rds vote in both houses. Together with the President's Article II duty to "recommend to [Congress'] consideration such measures as he shall judge necessary and expedient," this "veto power" gives the President a vital role in the legislative process.

That role, however, is limited to proposing & blocking legislation (& indirectly influencing the content of legislation through the selective exercise of those powers). In no circumstance can the President legislate on their own authority without the concurrence & collaboration of both houses of Congress.