Politico: "Democrats plot ways to force release of Mueller findings - Democrats signal that they're ready to use aggressive tactics to force the attorney general to make the report public."
They have invested so much into this narrative that it's impossible for them to accept Mueller's findings, that they once upheld as the gold standard. The Democrats know that the Muller report contains grand jury testimony and confidential information that, according to DOJ guidelines, cannot be released to the public. So it will be a year-long campaign of innuendo and hearsay with whispers of a cover-up.
Related - Byron York: "Five things that didn't happen in the Mueller investigation."