planning to instigate civil war. >> all of us in michigan can disagree about politics but those disagreements should never ever amount to violence. >> reporter: the fbi director warned members of congress that one of the biggest threats this country faces are from domestic extremist groups saying this is something they are very concerned about. shimon prokupecz, cnn, new york. >> thank you for that report. president trump's physician giving him the all clear to return to public engagements on saturday. now, we're told the president has completed his course of therapy for coronavirus, but meanwhile, there still hasn't been any information on the last time he tested negative before he tested positive for the virus or even when he was last tested at all. he could still be contagious, but the president talked to sean hannity last night about the rallies he wants to do this weekend. >> i think i'm going to try doing a rally on saturday night,