The government paid for both. If you hadn't had your head up your ass the whole time, you'd have heard people say they'd rather have paid for the wall than the invasion, but everyone with a lick of sense was sick of paying for both.
And that your priority of buying a big beautiful wall with a big beautiful door (remember that line from 2016? Of course you don't, but he said it) was just fucking stupid as long as it was the CIA importing them, because of course the CIA would be given a big beautiful key to the big beautiful door.
But you'd about have to double your brain capacity to understand that concept.