Russia investigation timeline: Robert Mueller and the probe into the Trump campaign's alleged collus

Since Donald Trump's election a shadow has hung over his administration - a federal investigation into possible collusion between the president's campaign and Russian agents. Robert Mueller, the stern former FBI director now leading the investigation, has charged dozens of individuals with crimes ranging from election interference to fraud along the way. Mr Trump has denounced the probe as a "witch hunt" - a view held by a number of leading Republicans. However the alleged crimes detailed by...