I could get behind a wall if:
A) It was constructed in a fashion that provided clear economic benefit (American jobs, materials, technical wherewithal.)
B) It was constructed quickly and inexpensively ($2B okay, $20B not okay. 3 years okay, 13 years not okay.)
C) It was constructed using sustainable materials so that it could be entirely disassembled and in some way re-purposed when its necessity has expired.
I'd personally rather see the money go toward building a 'digital' wall, for multiple reasons. I think it would be cheaper and stimulate a segment of the economy which could provide a slew of rich benefits in the long-term.
Julio, as for DACA, I agree with the general premise ... just find it to have been employed rather fecklessly.