How to get Captain TinyHands to think the wall is a bad idea. Hmmmm.
If ICE raided Mar a Lago while he was there, and took away all the illegals, so he couldn’t get his iced tea on time, that would probably do it.
Apart from that, opening free tours of tunnels dug under the existing fence would probably do something to convince the “base”. You’d have to advertise them fairly heavily on Breitbart and Faux, but just knowing they could take a tour and walk from the US to Mexico underground would be a big deal. Even if the tunnels were only open by appointment. (Wonder what would happen if there was a YUGE ad campaign targeting those outlets for cruises over the North Pole and through the NorthWest Passage?)
If the base dropped support, he’d drop support. It’s how he is.