A recurring character keeps popping up at this hearing: the American football team the Buffalo Bills.

The team hails from a city in Upstate New York and is known for its extremely dedicated and cold-resistant fan base.

Donald Trump tried to buy the team in 2014, an effort that blew up in a spectacular fashion and even dragged the rock star Bon Jovi into the mess.

His attempts to purchase the team is now central to a line of questioning by prosecutors, who are trying to prove that Trump fraudulently inflated the value of his business assets.

The Bills were up for sale about a decade ago, and Trump entered into a three-way bidding war between himself, the owner of Buffalo’s professional hockey team, and a group of Canadian investors using Bon Jovi as their frontman.

It got nasty very quickly. A group of anti-Bon Jovi activists tried to stonewall his group’s bid. Trump reportedly hired a Republican political operative to try and scuttle his rivals. The New York tabloids had a field day.

Trump did not ultimately wind up buying the Buffalo Bills, a point that his lawyer, Chris Kise, brought up when he objected to the prosecution’s line of questioning. He’s argued that the Bills aren’t relevant to the overall fraud case.