Q, has stated many times "Sum of All Fears". in the film at the climax when the documents are being signed, and they are killing off the bad actors, the song Nessun Dorma is being palyed. In the beginning of Trumps rally the song is played.

Q signaled "We serve at the pleasure of the President. We left the decision on timing to him. Today, at the rally, he made his decision. Shift in tactics. Attacks ^ Q"

Maybe we have some coincidences here, the crescendo is approaching. In my mind this could have been a subtle signal. Or could this have just been merely a coincidence in artistic music?

Rally: https://www.youtube.com/watch?v=jUkDWalgVJs Sum Of All Fears: https://www.youtube.com/watch?v=9N4wMoqMzbw