If he vetoes it, flood social media with support for building the Wall. Trump is the sort of guy who makes decisions based on market research data, so if he feels that’s the way to get reelected it’s exactly what he’ll try to do.
If he signs it…buy stock in gun manufacturers, ammo suppliers, alcohol, surveillance technologies, marijuana, opiates, Twitter, and gold. Prepare to short everything industrial except IT a few months before the 2020 election.
Aeoli Pera 
“If he signs it…buy stock in gun manufacturers, ammo suppliers, alcohol, surveillance technologies, marijuana, opiates, Twitter, and gold. Prepare to short everything industrial except IT a few months before the 2020 election.”
WE Vault-Co now (again). Pack your rice