Lots can happen between now and Nov. 2020, but, this suggests that the GOP may be able to flip back the roughly 20 seats needed to take back the House from the Democrats.
No shutdown. Just declare a national emergency and use emergency powers to build the Wall. If the black-robed Obama judges go full thug and shut him down, (1) appeal immediately to the Supreme Court, (2) order the military to close the entire border, both the crossings and in between, and (3) tell Mexico to build 1900 miles of Wall to our specifications - to get started quickly and he will reopen our border conditional on continued rapid and high-quality construction. The beauty of that last option? Mexico would really pay for the Wall.
In any case, it's time for Trump to stop pretending that America's enemies are negotiating in good faith. Globalists hate us. Leftists want us dead or enslaved. We shout respond to today's democrats appropriately.