WASHINGTON (Reuters) -A U.S. Senate investigative subcommittee on Tuesday opened a review into efforts by Facebook parent Meta Platforms to gain access to the Chinese market and is seeking documents from the company. Senator Ron Johnson, who chairs the Permanent Subcommittee on Investigations, joined by Senator Richard Blumenthal, the top Democrat, and Senator Josh Hawley, asked Meta CEO Mark Zuckerberg about allegations that it worked to build censorship tools for the Chinese Communist Party as part of its attempt to gain entry to the Chinese market, according to a letter seen by Reuters.