If you think his associates were fucking children or involved in the prostitution ring, just say so.

If you don't think that, well then we do have to hem and haw about how much guilt by association they carry. Because for a lot of people, business connections or rubbing elbows for money with bad people doesn't get much blowback. Just look at Tim Cook gladhanding dictators of nations where homosexuality is outlawed. Or manufacturing in countries with ethnic concentration camps.