In an act of desperation without releasing those tax returns, POTUS* tries to shift attention from a failing SCOTUS nomination to a messaging ploy about DoJ and FBI bias.
That meme has had trouble with traction because it’s been shown to be largely irrelevant, even as POTUS* has attacked the related figures on their party affiliations, extramarital activities, or their spouses’ appearance.
He is interfering with an ongoing investigation.
The meme about FISAs being biased only demonstrates further that there was actionable intelligence of wrongdoing and revealing more information simply to see that even more people had a low opinion of Trump in text messages will not work in favor of the Trumpists.
Without redaction, the release of classified information could compromise other investigations raising some more interesting questions. In the case of Ohr, it may work to scuttle the federal prosecution of Russians in (un)related cases, which is more Trumpian obstruction of justice.
Why would he do this now, having trial-ballooned this declassifying action weeks ago, It may be because Mueller is now ready to sentence Mike Flynn in November.