He thinks it 100% which leads to you and your total misunderstanding of Trump. There are many ways to have Mexico pay for the Wall it just seems to escape those from inside the beltway.
Will there be an invoice sent to Mexico and they in turn will send a check? No but the money can be extracted in many ways.
Remember when France came to Johnson and demanded Gold for dollars? We paid them off but Trump might have insisted they apply that money to their war debt like any non corrupt businessman might, just not a corrupt government.
Yes it may be extracted in many ways. But that’s not how he’s phrasing it. Or his priorities might change. Or he might be like most politicians and deliver a performance in office that is different from his promises in the campaign. The point is that Trump is clearly conditioning the battlefield to his advantage.
They will pay for the Wall one way or the other.
Reminds me of the Godfather, “Either your Signature or your Brains will be on that Contract”.