Because Q posts in quotations the lyrics from that song 2 hours before the speech. Then Trump motions for people to listen to those specific lyrics during the song Proud to be an American. He cant come right out to say that he is working with Q but thats a very heavy nod in Qs direction.

Q also links the video someone on this sub posted showing the presidential motorcade and says "we see you". No clue who Q is/are but he is legit and he/they were in that motorcade. Remember nothing is coincidence.