In remarks to the public at the Department of Justice, Mueller said that his investigation found that the Russian military's intelligence operation to disrupt the USA election in 2016 worked, but that the Russians and the campaign of then-candidate, and now-president, Donald Trump, did not conspire together.
Mueller said in his report that he did not think it would be fair to publicly accuse the president of a crime if he was not going to charge him. His report is "my testimony", Mr Mueller said, and he won't go beyond what is written in the report.
President Trump claimed vindication on the basis of Barr's summary.
During a swing through Iowa over the weekend, however, Booker seemed to hint at shifting his position amid mounting political pressure from the Democratic base, saying that he would consider backing impeachment if the administration continued in its attempts to stymie congressional investigations. US Attorney General William Barr, in turn, stated that the evidence against Trump in the Mueller report does not rise to the level of a crime.
Mr Mueller, for his part, complained privately to Mr Barr that he believed a four-page letter from the attorney general summarising his main conclusions did not adequately represent his findings.
Mueller was at the helm of an nearly two-year investigation looking into Russian meddling related to the 2016 USA presidential election. "The Attorney General then concluded that it was appropriate to provide our report to Congress and the American people".
Mueller basically said his hands were tied and he couldn't bring charges against the president. And the report is my testimony.
Wednesday's statement from Mueller may test that level of resistance from Democrats, especially since Mueller is refusing to speak beyond what he's already written in the report if called before Congress. Although the special counsel declined to charge Trump with obstruction of justice, he explicitly refused to exonerate the president.
"The report was clear - there was no collusion, no conspiracy - and the Department of Justice confirmed there was no obstruction", Sanders said. "The Attorney General preferred to make the entire report public all at once. After two years, the special counsel is moving on with his life, and everyone else should do the same".