That isn't exactly accurate. The only reference to Trump in that movie, is the black girl who says sarcastically, "and I'm gonna marry Donald Trump!" - the reference to Hillary Clinton, is earlier when McClane says to a driver who cuts him off, "who do you think you are lady, Hillary Clinton?" - and then a discussion between the two main characters about presidents ensues, where one mentions Hillary as a possible future president, and it is kind of dismissed as a possibility. It is a strange piece of dialogue.
Fake as hell. Clearly headlights being reflected. The "spaceships" wouldn't be moving only in one lateral plane, and everybody else on the road would be crashing and screaming seeing this happening over their heads. Plus, there would be dozens of other videos from other positions, as well as witnesses everywhere. We would be inundated with disclosure stuff, or the government downplaying it at every level by now.