A series of activist groups plan to swarm the streets of Washington, D.C., on Election Day, in anticipation that President Trump gets results that he does not accept.

The groups, under the organization of ShutDown D.C., plan to disrupt traffic on the streets surrounding the White House and the National Mall with more than 10,000 people, according to organizers. Kaela Bamberger, the group’s communications director, said that activists will “mobilize quickly” if Trump attempts to interfere with the election.