Yes, but Trump's claim is that there were a number of them celebrating in New Jersey and it was on the news that they were. Nobody, as far as I'm aware, has been able to find such footage. This is a statement about an event that occurred in a specific place and that it was seen on a specific medium. It wasn't a general statement about Muslims celebrating, which I did see particularly among hte Palestinians. Instead of doing what a normal person would do and say that they were mistaken about the details, Trump dug in and kept insisting he saw it.
Now, I'm sure someone's going to come along and say I'm just taking it too literally. So I've decided whenever a Christian attempts to convert me to Christianity, I'm just going to tell them that they take the New Testament and Jesus too literally.