The top Democratic leaders in Congress sent an “urgent request” to the Department of Justice Wednesday urging them to either cancel a planned briefing with Republicans on special counsel Robert Mueller’s investigation, or invite Democrats to the meeting.

“This meeting is completely improper in its proposed form and would set a damaging precedent for your institutions and the rule of law,” wrote Senate Minority Leader Chuck Schumer, D-N.Y., and House Minority Leader Nancy Pelosi, D-Calif.