It's OK that you don't understand what the Constitution says, and how it's been interpreted. I don't expect you to ... you only understand what Trump tells you to think.
Right now, a child given birth at Miami airport by a UK citizen IS a US citizen (assuming that child isn't the child of a diplomat). And it's been that way for quite some time, per the Constitution. There's a wannabe dictator trying to change that, despite being violative of the Constitution, but, as yet, he hasn't been entirely successful in destroying our representative democracy.
I may even agree with you that this *shouldn't* be the case - i.e. I wish the law was different ... but I also believe in rule of law, and the Constitution provides for birthright citizenship in that instance. Change the Constitution if you want to change this. It's very straightforward. It's not OK to short-circuit our Constitution to get our way.
I remember when you guys used to pay lip service to the Constitution as a way to try to rationalize your views and behaviors. That was your primary argument in most instances ... "but I believe in the Constitution, not like you ..." is something we all heard over and over again when there was a difference in interpretation. We knew you didn't really mean it - that it was just an argument of convenience ... but now that you've found someone to lead you who really doesn't give a crap about the Constitution, you threw that fake argument to the side, and now proudly flaunt your disdain for the supreme law of the land ... replacing it with a wannabe dictator's whims.