Mueller's much-anticipated report is set to be released to the public and Congress with redactions on Thursday morning, the Justice Department announced Monday.
The almost 400-page report is the most anticipated political report in the last 20 years as both Republicans and Democrats scramble to defend or attack President Trump in the wake of its release.
Trump's criticism also strikes a very different tone than the White House took in the days that followed Barr's summary letter, which cleared Trump of a criminal conspiracy, though the details of the investigation remain to be seen.
Barr said the special counsel didn't find a criminal conspiracy between Russian Federation and Donald Trump's associates during the 2016 presidential campaign. Barr said he reviewed Mueller's evidence and made his own determination that Trump did not commit the crime of obstruction of justice.
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Barr said he identified four areas of the report that he believed should be redacted including grand jury material and information the intelligence community believes would reveal intelligence sources and methods. Trump tweeted. "Attorney General Barr will make the decision!"
Barr has said he will redact from the Mueller report information on "other ongoing matters", including inquiries referred to other offices in the Justice Department. The different categories of redactions will be color-coded in the final report, Barr told lawmakers.
Justice Department regulations give Barr, a Trump appointee and the top US law enforcement officer, broad authority to decide what to release and what to withhold from the report. Despite Barr not making a ruling, Barr said that the evidence was lacking to charge the president with obstruction.
Trump and many of his supporters have largely overlooked the "not exonerate" line, as they have repeatedly said the Mueller report was a "complete exoneration".
The attorney general has pledged to testify publicly about the report's conclusions before the Senate and House judiciary committees - on May 1 and 2, respectively.