“How Trump tracks down those payments is unknown. But what is known is that those payments are the rise.
The AP reported remittance payments to Mexico rising nearly 5% in 2015, an all-time high and more than oil firm Pemex’s”
Maybe he tracks them using the method the AP is using?
You can either require the same for wire remittances or charge a fee to help cover some of the costs of having illegal aliens in the country.
It ain't rocket science. If Americans choose to stay "in the shadows" to avoid our banking system, it shouldn't be an undue hardship for illegal aliens either.