President Donald Trump was on stage at the Iowa State Fairgrounds earlier this month, kicking off the country's 250th anniversary celebration, when he heard what sounded like fireworks in the distance. “Did I hear what I think I heard?” Trump remarked as he spoke from behind a wall of thick, bulletproof glass. The comments, just days before the first anniversary of Trump's near-assassination in Butler, Pennsylvania, served as a stark reminder of the lingering impact of the day when a gunman opened fire at a campaign rally, grazing Trump's ear and killing one of his supporters in the crowd.