In an interview with CNN's Jake Tapper on Sunday, Donald Trump responded to a question about the Ku Klux Klan and white supremacist David Duke by denying knowledge of the groups, and asking for a list so he can do some research.

Then again, in 2000, Donald Trump knew exactly who David Duke was:

Update: Trump denounced Duke... on Friday, two days before telling CNN he had no knowledge of the white supremacist.

Republicans go to the polls on Tuesday.