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There is a particular coordination of events that has been visible since December 2017 when the first evidence of the FBI and DOJ operations against the Trump campaign surfaced. In the past six months a great deal of granular timing relates to this coordination. In January 2017 the DOJ IG began investigating FBI and DOJ conduct during the Clinton investigation in 2015 and 2016.
Toward the end of 2017 a joint House Judiciary Committee and House Oversight Committee venture was established to look into the FBI/DOJ handling of the Clinton investigation, and the Trump counterintelligence investigation. Judiciary Chairman Goodlatte and Oversight Chairman Gowdy established the joint-oversight venture and then little happened as they awaited the completion of the OIG internal review.
Between the Fall of 2017 and May 2018 the final stages of the DOJ-OIG investigative inquires took place. In this period DOJ Inspector General Michael Horowitz was joined with federal prosecutor John Huber. Horowitz focused on the ongoing internal investigation, while Huber received evidence carved out that holds value for criminal prosecutions.
During the period of January through May 2018 all congressional witness testimony from the FBI and DOJ participants to oversight committees was filtered through the need for U.S. Attorney John Huber to retain the integrity of criminal evidence. Toward that end, testimony from multiple witnesses, sought by congress upon members of the DOJ and FBI, was cancelled. Some of that testimony was cancelled at the last minute as the DOJ negotiated with congress and likely explained the reasoning therein.