Article I of the U.S. Constitution grants Congress the power to make law and to allocate how money is spent in the enforcement of those laws. The president’s role, in contrast, was envisioned by the founders as much more limited. They didn’t want a king, who could govern as he pleased without accountability to the people, and so they restricted his role to Commander in Chief of the military, with the power to make treaties only with the advice and consent of the Senate.