Apparently, it was the USFL. There’s a lengthy Wikipedia article on the subject. In a nutshell, he wanted an NFL franchise, but nobody would sell to him. He ended up with a USFL team (New Jersey Generals), led a lawsuit against the NFL. The USFL won the case and was awarded – drumroll – $3 in damages. The league folded.
I did, too. After a hurricane that brought enough water into my house that the ceiling in our bedroom collapsed, they told me we didn’t have any roof damage. When I told the agent we were moving to another insurer, he just shrugged his shoulders.
Giuliani claims Trump still owes him $2 million.