When you start strong-arming people, expect them to push you back sooner or later.
I say we make Donald Trump pay for the wall, and we have many ways of making his life miserable to make sure he does it.
1) Revoke his citizenship. 2) Make IRS audit his companies. 3) Stop approval of various permits for his various buildings until he complies.
The things we can do as a government to this chump are endless.