Created during the post-Nixon tightening up of executive power rules. It reduced the number of national emergency powers and created a system of oversight.
He just has to sign a declaration and name which ‘national emergency’ powers he plans to use.
But some are only unlocked if Congress declares a national emergency. The number is 123 if Trump alone makes the move.
[Figure from The Brennan Center for Justice]
The key for W House + critics likely to launch legal challenge is whether building the wall falls into the remit of the power Trump picks.
Upside: Construction mentioned and Trump could seek to justify military bit by linking illegal immigration + national security (which he often does)
Downside: Legal definitions for such construction are all connected to military facilities. The wall, obviously, is not.
Civil works can only be funded if they are “authorized” (i.e. already approved.) Would the wall count?
Also there’s a qu about how much cash there is left in the civil works project.
So in short - calling a national emergency may not be the panacea Trump’s backers crave.
*end*