A lawsuit has been filed by billionaire investor Leon Black. He is seeking to block certain subpoenas. These subpoenas were issued as part of an investigation into a financier. The investigation is being conducted by a congressional committee.

The subpoenas were served after a voluntary interview. During this interview, Black allegedly refused to answer certain questions. The committee is now seeking documents and testimony from him.

Further details about the lawsuit and investigation are available. The case involves a dispute over the committee's authority to obtain private information.