“He made up stories in order to try to impress people,” Lowy said. “He felt like he didn’t have a background that he respected or liked.”

Then Donald Trump burst onto the political scene.

Sayoc, a 56-year-old Florida man who friends and other associates say had never shown any interest in politics, suddenly began sharing images of himself on Facebook at Trump campaign events. He signed up for Twitter, where he trafficked in conspiracy theories and conservative memes. He registered as a Republican to vote in Florida ­— Lowy said he believes it was for the first time in Sayoc’s life ­— in 2016. He traded out his Native American decals for ones that supported Trump.

“Had no interest in politics, was always at the night clubs, the gyms, wherever he thought he could meet people, impress people. And along came the presidential campaign of Donald Trump, who welcomed all extremists, all outsiders, all outliers, and he felt that somebody was finally talking to him,” Lowy said.