Trump has promised to do many things that are simply not among the actions that POTUS can take unilaterally. Some actions require Congressional support, while other actions are governed by existing treaties. And then there is the US Constitution.
But the President does have certain unilateral powers, both in his role as Commander in Chief, and via Executive Orders.
What are some of the Trump promises that are within the scope of Presidential powers?
And what actions could he really take in his first weeks in office?