Trump's rhetoric surrounding the immigration of Muslims is inflammatory, irresponsible and racist and the KKK supports Donald Trump for obvious reasons: he scapegoats and verbally attacks specific ethnic groups in order to rile up his supporters and in doing so provides justifications for violence and harassment by racists. 
What has become obvious from the Trump victory is that, among the whites that voted, approximately half supported Trump because of or in spite of his racist rhetoric. In either case those voters lent their support to a candidate that cynically uses racism as a weapon against non-whites for political gain. He makes the KKK more legitimate and has stunk up the whole political atmosphere with his demagoguery. The man is disgusting as are his supporters. TRUMP's USA--->KKK