Donald Trump is refusing to disavow his endorsement by David Duke, saying he doesn't know anything about the former Ku Klux Klan leader.
Trump was asked on CNN's "State of the Union" whether he would declare that he didn't want Duke's support, or that of other white supremacists in the presidential election.
Trump says of Duke, "I just don't know anything about him."
Trump likewise says he wouldn't condemn a group that he knows "nothing about." He adds that if he were sent a list of groups he would research them and "certainly" would disavow any if he thought there was "something wrong."