A batch of Hillary Clinton’s private emails that were published Thursday by the State Department included at least one that appeared to have been marked classified when it was written, contrary to Clinton’s longstanding argument that nothing she sent or received was ever marked as such.

The classified message was among 275 emails that were upgraded to fully or partially classified in the latest trove of emails.

The emails included a message from Harold Koh, a State Department legal adviser, that was marked “confidential” both in the subject line and in the body of the email.

It was officially classified as “confidential” by the State Department before being posted online late Thursday afternoon.

Agency officials have argued none of the emails were classified at the time they were written, and that all designations were made in light of information that has emerged since Clinton left office.