"I don't think the president has any problem with it," Sanders said on a television show on NBC channel.
"He's more than happy for any of this stuff to come out because he knows exactly what did and what didn't happen and now frankly the rest of America knows," Sanders added.
Echoing Trump, Sanders said the American public knows "there was no collusion, they know there was no obstruction and it's a complete and total exoneration of the president."
In a letter sent to Congress summarising Mueller report on Sunday, Barr quoted Special Counsel saying, "While this report does not conclude that the president committed a crime, it also does not exonerate him."
Barr said the investigation did not recommend any further indictments and does not have any further sealed indictments outstanding.
Special Counsel Robert Mueller found no evidence regarding Trump or his campaign conspiring with Russia to influence the 2016 election in his favour.
Following Barr's letter to Congress, House Speaker Nancy Pelosi and Senate Minority Leader Chuck Schumer demanded the report to made publicly release while stressing that it does not exonerate Trump.
They also said Barr, nominated just months ago by Trump, is "not a neutral observer" in the process and that his summary of the report is not an objective determination about Mueller's findings.
Meanwhile, Trump called the outcome a "complete and total exoneration" despite Mueller's caveat on obstruction.
(With inputs from agencies)
'He's more than happy for any of this stuff to come out because he knows exactly what did and what didn't happen and now frankly the rest of America knows,' Sanders said.