Nowhere in Article II of the Constitution does it say that. It’s as false as the notion that a corporation must maximize return to shareholders as a matter of law.

At most, the Article requires the President to take an oath of office to protect and defend the Constitution, but that’s a far cry from requiring he do everything possible to make the USA the most profitable country in the world.

Sometimes putting America first means being an altruistic and cooperative international citizen. PR is real.