From the highly reputable and not failing New York Times "Trump Campaign Aides Had Repeated Contacts With Russian Intelligence". Their source is the National Security Agency!
2017-02-15T07:53:54Z
Violation of the Logan Act and coordinating with a foreign government against your own. There's a word for that...TREASON!
Nobody can guess the mind of Trump. I think he enjoyed threatening her. I don't think he has enough attention and energy to shepherd a formal investigation for several years and wait out a possible conviction, which most likely would never occur since there is no evidence of criminal wrongdoing according to the FBI.