This week, Donald Trump had one of the best days of his presidency.

US Attorney-General William Barr announced that Special Counsel Robert Mueller had finished his investigation and found there was no evidence of collusion between the US president’s campaign and Russian efforts to meddle in the 2016 US election.

On Please Explain this week - Nick O’Malley dives into Meuller’s report. US correspondent Matthew Knott and Deputy World editor Chris Zappone grapple with the question of whether the report is an indictment on US democracy, or merely another Trump scandal likely consigned to the scrap heap?