The U.S. Supreme Court today refused to block a congressional subpoena that demands internal documents and testimony from classified ad site Backpage.com over how it screens ads for possible sex trafficking with minors.

The decision was expected but Backpage held out hope last week when the Supreme Court gave the company a temporary stay of the disclosure order. Backpage’s lawyers had argued that turning over the documents would cause “irreparably injury” to the company and its CEO Carl Ferrer.

With the end of the temporary stay, the Supreme Court essentially ruled in favor of the Senate panel, which has been pursuing Backpage for more than a year. The Senate Permanent Subcommittee on Investigations has been seeking the documents as part of its investigation into human trafficking over the Internet. Senate investigators say Backpage is a market leader in commercial sex advertising

When Backpage first refused to comply in March, arguing that the process for reviewing ads in its adult section is a “core editorial function” protected under the First Amendment, the Senate voted to hold the website in contempt. That move sent the battle to the courts.

Backpage now has 10 days to comply with the subpoena. Backpage lawyer Liz McDougall had no immediate comment.