The article, “How Trump’s Remarks About Clinton Email Probe Mirror Birtherism,” has a simple enough basis. Regarding Obama’s birth certificate, Trump (in one of the articles selected quotes) said:
He may have [a birth certificate], but there’s something on that, maybe religion. Maybe it says he is a Muslim," he said. "I don’t know. Maybe he doesn’t want that.
Trump asserted without qualification that there is something on Obama’s birth certificate that he doesn’t want disclosed.
For Clinton’s emails, Trump similarly says:
During a campaign rally in Grand Rapids, Michigan, Monday, Donald Trump said he was "sure" that what’s contained in the emails at the center of the FBI‘s renewed probe into Hillary Clinton‘s use of a private server is "absolutely devastating."
I get upset about con men defrauding the elderly, about rape and murder. I have a hard time getting excited about a private email server, and certainly do not understand how that is a threat to democracy.