Lawyers for Andrew Miller, a former Roger Stone aide who is fighting a grand jury subpoena in special counsel Robert Mueller’s probe, as well as at least five attorneys from Mueller’s team spent nearly an hour and a half Wednesday in the D.C. courtroom of Chief U.S. District Judge Beryl Howell.

The two defense attorneys, when exiting the courtroom at a little before 11 a.m. ET, confirmed they were representing Miller but would not say anything more about what happened behind closed doors or why they were there.

They had entered Howell’s courtroom around 9:30 a.m. ET, a few minutes after a handful of Mueller prosecutors entered the courtroom. Reporters were not allowed to enter the closed courtroom.

Among the members of Mueller’s team TPM spotted were Michael Dreeben, Elizabeth Prelogar and Adam Jed.

Miller’s attorneys had last month sought to quash the subpoena, Politico reported. His appearance in front of Mueller’s grand jury was postponed, according to the Politico report, with lawyers from Mueller’s team offering Miller’s attorneys potential dates for hearings in front of Howell. One hearing would be on whether Miller’s motion to squash was timely, according to Politico, and the other on its merits.

It is not clear whether Wednesday’s closed-door proceeding was either of those hearings, or about something else.