Trump’s golf habit has raised alarms about security for years

“A golf course is kind of scary. It’s so open,” said Jillian Snider, a retired New York Police Department officer who is now the policy director of think tank R Street Institute.

But golf courses present both advantages and disadvantages for agents, Snider said. On one hand, there are few buildings or other structures on which a would-be shooter could post up, she said. On the other, an expert shooter might have relatively unobstructed access to his or her target.