>>Trump promised that Mexico would pay for the wall.<<
Tax $ transfers and we can gild it!
I have no idea why President Trump and/or Congress isn’t doing this.
For openers, President can’t levy a tax. The Congress must do that.
Secondly, any one with money and an internet connection can easily transfer money to an office in Mexico that gives it to whom ever it is being sent. The Two parties settleup periodically by official bank transfer.
In days not very long past, Mexicans could purchase mexian lottery tickets in their local bean house via the restraunt fax to a contact in Mexico city. I would presume that is via the internet now.
Thirdly, banks are in the business of international funds wire transfer. Any such method you propose would be discrimatory if not applied to banks.
Trump cannot appropriate funds. Only Congress can.
There, I fixed it for you.......