Russian interference in the 2016 United States elections

What is it? What are its findings? How did Russia respond?
Hillary Clinton says the public “deserve to know” what’s in the dossier on possible Russian influence on British democracy.
The president wagged his finger at the Russian leader and told him not to meddle in the US election.
It will be Mueller's first public statement on the probe into the 2016 Trump campaign and Russian interference in the election.
Labour deputy leader Tom Watson has demanded action from the government.
Fresh revelations show his pre-referendum links with Russian embassy officials run deeper than he previously admitted.