Mueller on Friday released his report to Trump-appointed Attorney General William P. Barr, who on Sunday summarized for the Senate Judiciary Committee that Mueller's investigation did not find that the Trump campaign conspired or coordinated with Russian Federation in an effort to influence the 2016 USA presidential election.
Barr's four-page document said Mueller did not find that Trump's campaign "conspired or coordinated" with the Russian government to influence the 2016 presidential election - knocking down arguments from Democrats who have claimed there was evidence of such collusion.
Without a recommendation from Mr Mueller, Mr Barr stepped in and decided there was not sufficient evidence to establish that the president obstructed justice.
Trump also said he had not thought about pardoning anyone convicted or who pleaded guilty in the Mueller probe.
"Instead, for each of the relevant actions investigated, the report sets out evidence on both sides of the question and leaves unresolved what the Special Counsel views as "difficult issues" of law and fact concerning whether the President's actions and intent could be viewed as obstruction". Meanwhile, multiple investigations into Trump's conduct are being carried out by the Southern District of NY.
Even some high-level Democrats were talking not so much of ramping up investigations but the need to address bread-and-butter domestic issues.
Trump, who has spent this weekend at his private club in the state of Florida, touted Barr's summary as a "complete exoneration", while again lashing out at Mueller's investigation that has shadowed his presidency for the past two years, which he has repeatedly called a "hoax" or a "witch hunt".
Mr Trump has spent months railing against former Justice Department officials, including former Federal Bureau of Investigation director James Comey, accusing them of an illegal witch hunt for the goal of delegitimising his presidency.
"It's one of those hard realities that sometimes things don't turn out the way you wanted them to", said Democratic political consultant Colin Strother, who is based in Austin, Texas.
On Sunday, U.S. Attorney General William Barr sent a summary to lawmakers saying the Mueller investigation found Trump's 2016 presidential campaign did not conspire with Russian Federation.
While Democrats' congressional hearings are not likely to quietly fade away in coming days and weeks, there is now more risk attached to them.
"I think that the president is doing exactly what he should and that's leaving that decision into the hands of the attorney-general and we'll see what decision he makes on that front", Sanders said in an interview on NBC's "Today" program on Monday.
They're demanding full access to what else the report says. 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.
House Speaker Nancy Pelosi and Senate Minority Leader Chuck Schumer said Barr's letter "raises as many questions as it answers".
Congress is also continuing its own inquiries, mostly in the Democratic-controlled House of Representatives.
Russia's Foreign Ministry also said the allegations of election meddling against a number of Russians were politically motivated.
On March 5, Mueller visited the Department of Justice's main office in Washington to meet with Barr and Rosenstein and told them he would not be reaching a conclusion with respect to obstruction, a decision that was unexpected, a department official said.