A summary of the Mueller Report says the investigation did not find any evidence that Donald Trump's campaign colluded with Russia during the 2016 election.
The US President has declared himself completely exonerated.
But the summary Attorney General William Barr presented to Congress does not exonerate Trump from obstructing justice.
Democrats are demanding to see the report in full.
Al Jazeera's Patty Culhane reports from Washington DC.