Canada

Trump has invited the Truckers to come to Washington DC to really make a point. I would think that the U.S. intelligence community, the National Guard, etc are closely going to monitor any type of convoy coming across the border, any group of trucks, or from anywhere surrounding Washington DC

I'm waiting for some nut job to start a mass shooting in the center, and the police not able to get through the crowd.
Or a fire, and the FireDept not able to get their engines into the area.........

(Those things would certainly fall under the: "Unintended Consequences" that is normally a sign of a lack of critical thinking.....)