How can you tell it’s a trick?
It’s still on Twitter under “Donald J. Trump retweeted”.
If it was a trick wouldn’t Trump be able to take it down?
I could be wrong, but I think the original source started here on FR clear back on Aug.26 The poster is adept at editing video. He refined it slightly later to what you now see posted.
http://www.freerepublic.com/focus/news/3580787/posts?page=33#33
I heard it from blueplum.
http://www.freerepublic.com/focus/f-news/3586598/posts?page=25#25