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

[Damocles]

Article Two of the 1789 constitution gives the President broad authority to issue executive orders that manage the operations of the executive branch. Acts of Congress may also give the President the authority to enforce specific legislation as he sees fit, called delegated legislation.

Considering how paralyzed Congress often is, it’s not hard to see why they’d delegate so much to the President just to get something done. The fact is that the gridlock naturally evolves a system to overcome the gridlock, and in this case, hey presto - authoritarianism and the compromise of legislative authority!