The public couldn’t listen to a public court hearing Monday night over acting White House chief of staff Mick Mulvaney’s House impeachment subpoena, a federal judge in Washington said.

Court security told three reporters from CNN, Bloomberg and The Washington Post to leave the DC federal courthouse minutes before the 5 p.m. ET start time for the hearing. The hearing, which was held over the phone, would not be open to the public and the judge was not in his chambers, according to court security guards who spoke to the judge’s chambers Monday.