Cruz already called for a wall...Trump talked about it on one of of his ralleys last week.
Yes he did, but the Trump supporters will say it was Trumps idea from day one. Here are the facts, not that facts matter much to Trumpsters. :
Yes, I know. Others have as well. . .
Check out :
https://en.wikipedia.org/wiki/Secure_Fence_Act_of_2006
https://www.youtube.com/watch?v=r0lwusMxiHc
Why would Trump say “All talk, no action!” ?