Hopefully a lot of prep and design work is being done "behind the scenes" so as to be in-place when Mr. Trump makes the emergency declaration.
This is going to be "the only way out" for him, if indeed he wants the border wall (and re-election, for he can't be re-elected without it).
The democrat-communists will NEVER give in to this in the House.
There has to be an end-run around them, and "national emergency" is it.
Also, it's going to be necessary to have a team of lawyers "at the ready" to counter lawsuits regarding eminent domain for the necessary "taking" of property to get the barrier underway.