Trump
Strange as it seems, we still have - years later - controversies and disagreements about whether there was collusion between Russia and the 2016 Trump presidential campaign. It seems like this would be a good toic to get on the same page about before the 2020 presidential election, as there must be tens of millions of Americans who are laboring under delusions and won't be empowered to vote responsibly unless we can clarify this topic.
Barack Putin Josh Ari
Collaborators:

Ex White House Press Secretary (under George W Bush) Ari Fleischer asserted that Barack Obama asked Vladimir Putin for help with his re-election campaign. Journalist and pundit Josh Marshall, of Talking Points Memo, asserts that this didn't happen.