head covering. >> you should be able to assemble peacefully and whether you're jew our muslim or christian. and if we're worried about violence, what does that say. >> reporter: the adl's points to three ways to attack it. greater moral clarity at colleges and universities, citis have to hold their leaders more accountable and he said jews and muslims and christians and others have to ban together to fight all of this. that it is not just a jewish problem. brian todd, cnn, washington. still ahead, a historic day for the kingdom of denmark. the only female sovereign has just abdicated the throne. her r son isis now king.g. the latetest is nextxt.