In a February 2016 interview on CNN’s State of the Union, Trump avoided condemning or disavowing the endorsement of white supremacist and former KKK grandwizard David Duke, saying he didn’t know who Duke was.

In years prior, Trump had commented on and repeatedly attacked Duke and his platform. In 2000, he cited Duke’s participation in the Reform Party as a reason he no longer wanted the party’s nomination, saying, “The Reform Party now includes a Klansman, Mr. Duke, a neo-Nazi, Mr. Buchanan, and a communist, Ms. Fulani. This is not company I wish to keep,” ending his presidential campaign for that election year.

After the State of the Union interview, Trump maintained that he always had and would continue to disavow Duke’s support.

Time – Donald Trump Refuses to Condemn KKK, Disavow David Duke Endorsement
NPR – Trump Fails To Condemn KKK On Television, Turns To Twitter To Clarify