Unredacted.

The fact is, Trump will not be much longer in the office if he does not act now. Arrests of low level criminals is only resulting in the opposing establishment making even bolder moves. At the current pace, they have all the time they need to finish their plan to end Trump's term before it truly even began. Resignation of Flynn and recusal of Sessions were only the very beginning of it.

By releasing the 650k emails and exposing the crimes committed by the previous administrations and the establishment Trump would win the trust of the entire public. At the moment, the country is extremely divided and the establishment is pushing this polarization even further through the lies of the mainstream media. Their plan rests on people believing the message of the media and they will succeed unless Trump exposes the corruption at the highest level. Their biggest fear is losing of the public trust (the half of it left) and Trump can make this happen by making the evidence public. This would unify people behind Trump and ultimately tip the scales of power behind him.

Edit: a few of the major sources, which have already mentioned the 650k Clinton emails:

http://www.marketwatch.com/story/fbi-to-search-650000-emails-on-weiners-laptop-in-clinton-probe-2016-10-30

https://www.wired.com/2016/11/yes-donald-trump-fbi-can-vet-650000-emails-eight-days/

https://www.wsj.com/articles/laptop-may-include-thousands-of-emails-linked-to-hillary-clintons-private-server-1477854957