Thousands of President Trump’s supporters reveled in the raucous start to his 2020 reelection campaign last night. But around 150 folks in and around Orlando’s Amway Center weren’t having very much fun at all.

Namely, the agents and officers of the U.S. Secret Service. Because for those public servants and their compatriots across the nation, two factors will make the 2020 campaign a particular protective challenge: scale and emotion.