There was also this incident [attempt], considered suspicious at the time:

2017: "An online video has surfaced purportedly showing a vehicle attempting to “ram” President Trump’s motorcade in Missouri, but officials said the incident was simply a case of malfunctioning brakes.

The two-minute YouTube clip shows the beginning of the presidential motorcade cruising down Kearney Street in Springfield on Wednesday when suddenly a white car appears out of a wooded area and veers off to the side of the road."

nypost.com/2017/08/31/rogue-vehicle-gets-too-close-to-donald-trumps-motorcade/