What Burns really said was, "We see nurtured in his [Trump's] campaign an incipient proto-fascism."
http://news.stanford.edu/2016/06/12/prepared-text-2016-stanford-commencement-address-ken-burns/
And Burns went on to list a lot of personal characteristics of Trump he didn't like, most of which are true.
But to give the mendacious Hillary a free pass, as Burns did, was disingenuous and dishonest, unworthy of a competent historian who surely knows better, but was unwilling to spill the beans, for blatantly political reasons.
The whole truth was not served, as is usual among liberals. 