JOHN SOLOMON: Ten post-Mueller questions that could turn the tables on Russia collusion investigators.

The process of meting out accountability has begun.

Horowitz, my sources tell me, has interviewed between 50 and 100 witnesses in his exhaustive probe. Graham and his predecessor as Judiciary chairman, Sen. Chuck Grassley (R-Iowa), laid out the most important investigative issues they saw in a letter last year. This month, former House Intelligence Committee Chairman Devin Nunes (R-Calif.) sent a letter to DOJ identifying eight potential criminal referrals. His committee last year also released a memo on abuses of the Foreign Intelligence Surveillance Act (FISA) that may have occurred during the Russia probe.

And President Trump reportedly is readying an order to declassify five key buckets of documents on alleged FBI abuses.

My sources agree these 10 questions are the most important to be answered in the forthcoming probes.

Click on over.