07/21/2020- Defendant wore a wire in undercover operation targeting Joe Biden in 2010
tl;dr version... Witness alleges Biden and son Beau were aware of illegal fundraising. Conveniently, the US Attorney for the state of Delaware found none of the activities worth prosecuting. Beau Biden served as the Delaware state Attorney General at the time.
https://www.politico.com/news/magazine/2020/07/21/christopher-tigani-joe-biden-fundraising-373724