What part of the take care clause do you not understand? The social security bill does not list paying person 1 2 or 3. It sets the criteria the executive branch executes.There is a huge difference.
Lots of those laws that cover what Trump is fighting say "spend X on Y" but don't give details on paying A,B,C to achieve Y.
No one disputes the SS laws say make payments to people ENTITLED to them as qualifying for retirement benefits.