He can build a wall no one can climb over.
Of course, he has never built a wall in his life, he has never designed a wall in his life, and thousands of prison architects have been trying to build a wall no one can climb over for millennia and no one has done it.
But Trump can. He obviously can, since he said he can, and even though he has obviously lied before, this statement you can take to the bank.
And if you can't see these obvious facts, you're too stupid to understand the pablum the Establishment Media is shoving down your throat on behalf of the very Anti-Establishment Guy who had Bill and Hillary at his wedding.
Now aren't you ashamed for doubting it?