I would be careful for those who want Trump to go down the road of calling it a national emergency to build a wall. Also, the money would be taken away from real national emergencies like the wildfire damage in California and the hurricane damage in Puerto Rico.
What goes around comes around and the next democratic president could very well use the national emergency excuse as a way for liberal causes.
They could say we have a national emergency crisis with guns and mass shootings and use the national emergency excuse to ban AR-15 type assault weapons or do something more aggressive with climate change etc..
Plus the wall would take years to build and the money would be better used on things like high tech security along the border.
Again, there is no crisis along the southern border regarding illegal immigration. The trend is downward and has been for years. The wall has only about a 35% favorable rating. It's a manufactured crisis by Trump to excite his base.
The real excitement comes February 7th when Michael Cohen testifies publicly before congress. Then we'll hear first hand about Mr. Trumps dirty dealings.