Q. Why now
A. Trump's desperate to change the conversation, and will do almost anything to do so - no matter who it hurts, as long as it's not him.
Why didn't Mr. Transparency Award, Barak Obama, do it?
That is the better question.
Because the JFK Records disclosure act specified 25 years to release the remaining records
actually it was 75 years, with a proviso that they could be released after 50 years.