Should he be impeached? I don’t think there’s any question of it. I would be satisfied to see his pipe dreams defunded.
He’s not going to be removed from office, so I don’t think it’s worth the risk of making him a rallying point.
At the moment even the faithful are seeing him as a major jackass. The quickest way to turn that around is go after him, so those who would generally be moved to abandon him, would instead circle the wagons.
Just withdraw his purse. Quit providing funds for his pet projects. The House has this ability. It can do this unilaterally. It is Constitutional and there’s not a damned thing he can do about it.