Special counsel Robert Mueller had two key questions before him: Did the Trump campaign collude with the Russian government during the 2016 election, and did President Donald Trump commit obstruction of justice? In the 48 hours since Barr first received the report from Mueller, he and deputy Rod Rosenstein went further in Trump's favor, and have "concluded that the evidence developed during the Special Counsel's investigation is not sufficient to establish that the President committed an obstruction-of-justice offense". So what happens now?
Despite the relief at the White House, the Mueller probe painted a deeply unflattering picture of the divisive and populist real estate tycoon-turned-politician.
But Mueller's report hasn't dissuaded some of Trump's fiercest critics among the new Democratic lawmakers who helped flip the House from Republican control.
Democrats also signaled that they will curtail some public focus, at least, from their investigations of Trump and try to keep attention on their policy goals.
The letter does not detail what Mueller learned about a broad range of Trump associates who had Russia-related contacts during the 2016 presidential campaign and transition period. But on Monday Graham said he planned to invite Barr to testify in front of his panel. Questioned by reporters, Trump said he welcomed Mueller's results but complained he had been abused by the investigation occurring at all and taking too long. None of them were directly related to the question of collusion between the Trump campaign and Russian Federation.
While many grass-roots Democratic activists hoped that Mueller's investigation might force Trump from office, either through resignation or impeachment and conviction in the Senate, few Democratic political professionals ever shared that anticipation.
"All I'm interested in is them releasing the full report, the full Mueller report", said House Speaker Nancy Pelosi, D-Calif.
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At the same time, however, Republicans followed Trump's lead in looking into how the investigation began.
The letter was signed by House Judiciary Committee Chairman Jerry Nadler, along with five other House panel chairs.
Republicans who had mused about a primary challenge to Mr Trump if Mr Mueller returned a smoking gun may now stay on the sidelines.
Speaking in the spring sunshine outside the West Wing, Trump advisor Kellyanne Conway told journalists she had two words for presidential foes: "Move on".
In a statement, central New York Rep. John Katko (R-Camillus) said he believes the report should be released as completely as possible to put to rest accusations of collusion.
"Each of our committees is now engaged in oversight activities that go directly to the President's conduct, his attempts to interfere with federal and congressional investigations, his relations and communications with the Russian government and other foreign powers, and/or other alleged instances of misconduct", the letter reads. They include several of his former aides such as former campaign chairman Paul Manafort, former national security adviser Michael Flynn and former personal lawyer Michael Cohen.