Sorry, guys, the truth is that Trump hates the idea of birthright citizenship and is trying to find ways to deny it to people. Whether his schemes succeed or not is a matter for the courts.
But DonD, doesn't pretty much everything in the Constitution have "unintended consequences"? It was written when society, and life itself, was radically different. Yet, conservatives insist that the Second Amendment, written to safeguard the collective right of the citizenry to raise a militia, should be interpreted to mean that every individual has the right to own weapons of war. The Founding Fathers never imagined that the First Amendment would be applied to Twitter posts. Et cetera.
At the time the 14th Amendment was written, there were thousands of immigrants coming into the US every year. Not all of them stayed. Most did. It would not have been practical to say, "OK, you're only a citizen if your parents stay here for X amount of time." It was simpler to have one basic criterion for citizenship.
But you know what? Even back then, from the day the Amendment was added to the Constitution, there were people bleating about how all those spics/wops/kikes/bohunks/gooks/etc. shouldn't be allowed citizenship, because they were NOT REAL AMURRICANS and had come here to BE TAKIN' OUR JOBZ. The US government decided to take the compassionate approach, on the premise that having additional citizens was a good thing.
Now, Republicans and Trumpers are screaming that immigrants are bad. It can't be denied that they are making active efforts to choke off immigration, legal AND illegal. It's all part of the white suoremacist, fear-based narrative that titillates "the base."