Backpage.com cannot invoke attorney-client privilege to withhold documents from a Senate investigation into online sex trafficking, a federal judge in Washington ruled Sept. 16.

The ruling from U.S. District Senior Judge Rosemary Collyer of the District of Columbia came three days after the U.S. Supreme Court rejected Backpage’s bid to block the Senate subpoena, which seeks documents related to aspects of the online classified website’s business, including terms of use and editorial policies.