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Without knowing all of the details, the mere fact that all four of the line prosecutors withdrew from the case, as has been reported, suggests undue meddling by higher ups at DOJ or elsewhere, while it is not uncommon for a USAO to consult with Main Justice in such high profile matters( indeed, it is required for certain matters), it is unprecedented to have a USAO dramatically change their sentencing recommendation after its memorandum has been filed unless there has been a change in circumstances or facts.