Trump has no clue how airspace works:

Neithee truth nor reality has stopped him before. He's just going to spout whatever nonsense best supports what he wants and to hell with everything and everyone else. His puppets will mimic whatever comes out of his mouth to try to gain favor with their master

Listening to your explanation & then watching the video just before the crash is it possible that the helicopter saw the other plane that we see in the video? I bet there’s lots of traffic around DCA. Thanks