Trump immediately knew how good this was going to be for him in the upcoming election, His arm-pumping gesture is perfectly in line with his well known and highly egoic personality.
He was already reportedly telling friends that he has been receiving "gifts from the political gods". [0] If that's what he was thinking before this, what is he thinking now?
[0] https://www.axios.com/2024/07/10/trump-undecided-voters-plan...