But here's the bigger thing.
The Trump Wall is a terrible idea whoever pays for it. And even more, it's a racist idea, as well, given that we have a FAR, FAR longer unprotected border with Canada, and Trump has yet to call for the Canadian border to be protected. And not only can Canadians easily enter the U.S. from the north and stay illegally, but once they've entered the country it's really incredibly easy for Canadians to assimilate in the U.S. and then take jobs from American citizen. And don't fool yourself into thinking they haven't.
But beyond all that -- it can't be repeated enough:
"Mexico will pay for the wall. 100%. Believe me, folks, believe me. Mexico will pay for the wall."
If Trump and Republicans actually, really, truly want a wall along the Mexican border, then Democrats should insist the president keeps to his campaign promise. And the GOP should come up with a bill for building a wall that requires the administration to get funding from Mexico.
And while they're at it, they should do the same for Canada.