Trump refused to condemn that endorsement or say he didn't want the support of white supremacists — four times.
"I don't know anything about David Duke. I don't know what you're even talking about with white supremacy or white supremacist. I don't know. I don't know, did he endorse me, or what's going on?" he said. That prompted a back-and-forth that went, in part:
Trump: I don't know what group you're talking about. You wouldn't want me to condemn a group that I know nothing about. ... If you would send me a list of the groups, I will do research on them and certainly I would disavow them if I thought there was something wrong.
Tapper: The Ku Klux Klan?
Trump: You may have groups in there that are totally fine and it would be very unfair. So give me a list of the groups and I'll let you know.
Tapper: I'm just talking about David Duke and the Ku Klux Klan here.
Trump: Honestly, I don't know David Duke.