What is the fine-grained topic of the following text: The United States played a key role in working out the stand-down, and U.S. officials at UNESCO are considering making another plea for Congress to allow the U.S. to remain a member by changing a law that already reduced the country's role at the agency, a senior U.S. official said. Only return the topic.
U.S. participation in UNESCO and legislative changes to remain a member.