Who is going to pay for it? 
Could care less. Would rather use my tax money for that than for other junk.
Overheard convo:
"No way he is going to build the wall. That's hilarious. What a dummy he is. HAHAHHA"
"Oh, darn, we are wrong again."
"Hmmmmm....what can we focus on now. Crowd sizes....wait, I got one! Mexico Will NOT pay for it. Got it. Call CNN."
"HAHAHA, Trump is such a dummy."