Even as, on July 4, there were naturalization ceremonies in many cities in the US, each of those people became a real U.S. citizen upon swearing that oath. Trump might be able to shove non-citizens out the door as soon as they arrive, but it's a much more difficult process to denaturalize existing citizens.
The process, when it occurs, often takes years in court before a person loses citizenship status, and that's rare. Very rare. Naturalized citizens are, in fact, citizens, and any lawyer with any skills at all can tie up the process for years if an attempt is made to denaturalize any of them.
The limited number of courts with such jurisdiction and the limited number of federal government prosecutors available to bring such cases is the primary reason that no such effort will succeed. First the government must present very convincing evidence that fraud was involved in the original naturalization process. That's a high bar, since that process, itself, takes a long time and a good deal of documentation. The reality is that a very, very small percentage of naturalizations are fraudulent.
With regard to all that, Donwald Drumpf is talking out of his ass on this matter.
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