An accused U.S. Capitol protester spoke with an undercover Washington police officer on Jan. 6 who later connected the man to an undercover FBI worker, according to a new court filing. Fi Duong is facing charges for allegedly entering the Capitol during a joint session of Congress in January, for disrupting the session, and for impeding the session. He faces decades in prison. In an affidavit accompanying the criminal complaint, FBI special agent Jason Jankovitz said that Duong and an associate introduced themselves to an undercover Metropolitan Police Department officer on the morning of Jan. 6. Duong allegedly described himself as an “operator” and asked if the officer was a “patriot,” to which the employee responded in the affirmative. Officers later ascertained Duong was inside the Capitol several hours later. A week later, the undercover Washington officer linked Duong with an FBI undercover employee. The FBI worker learned that Duong belonged …