A lawsuit has been filed by billionaire investor Leon Black. He is seeking to block certain requests from a congressional committee. The committee had asked Black to provide documents and testify about his dealings.

The requests are part of an investigation into Jeffrey Epstein. Black had previously spoken to the committee in a closed-door interview.

Further details about the lawsuit and investigation are available from the source, including the specific arguments made by Black's lawsuit and the committee's actions leading up to the lawsuit.