Whether you support or oppose the wall as a concept, one thing that can generate more opposition to the wall is if we frame it as a broken promise of Trump. He said Mexico would pay for it. Do not authorize it until they pay for it.. which is .. it will never happen.
If he tries to play funny games with the money trail, all the Democrats have to say is that any concessions obtained in a future trade deal have nothing to do with paying a wall because we can get those same concessions even if a wall is not being built. So it’s not really the same as Mexico paying for a wall.
Be smart in how we oppose this wall. Mention how it is economically not worth it. And besides, it is a broken promise because Mexico isn’t paying for the wall. You do that and you can mobilize a lot more opposition to the wall instead of framing it as showing sympathy for illegal immigrants.