https://www.reuters.com/article/usa-congress-facebook/u-s-senator-asks-facebook-ceo-to-retain-documents-linked-to-testimony-idUSKBN2H2222 >WASHINGTON (Reuters) -Senate Commerce Committee Chair Maria Cantwell on Tuesday called on Facebook Chief Executive Mark Zuckerberg to preserve all documents related to testimony last week from company whistleblower Frances Haugen.