A Secret Service officer from the bicycle patrol unit grabbed me by the arm (or tapped me — I can’t remember which) He asked me to come with him back up the escalator. He said he had been observing me for two-and-a-half hours and wanted to know why I spent so much time around the White House. He was pretty sure he was taking surveillance photos of the White house. The officer snapped a photo of me for their files, and the two were the good-cop approach to me.”]
Source: https://www.csoonline.com/article/2125810/what-it-s-like-to-be-grilled-by-the-secret-service.html