President Trump controls the FBI and DOJ, and President Trump has all of the documents. Despite the theater, nothing within the Executive Department can be withheld from the president. When the president wants the good guys (and bad guys) in Congress to have it, they will get it. I believe that day is fast approaching.
If PDJT does in fact want FBI & DOJ documents, it will not be stated until after November.
Mueller, Rosenstein, Sessions and Wray control the FBI and the DOJ. They believe they are independent, of executive control, and of congressional oversight.
Trump says at some point he will get involved. I believe that day is fast approaching.
In the mean time, the Deep State calls the shots.