Wikipedia defines an invasion as:
An invasion is a military offensive of combatants of one geopolitical entity, usually in large numbers, entering territory controlled by another similar entity, often involving acts of aggression.[1]
Attacking Mexico would be an invasion.
Just don’t call any of this a plan for an invasion, U.S. government officials implore.
Go fuck yourself. It's an invasion.
Team Trump Is Actually Drawing Up ~~Attack~~ Invasion Plans for Mexico
Sounds like the meeting was just long enough for Trump to receive his new orders.