Why is this investigation happening? The FBI and Justice Department are investigating possible co-ordination between Trump's campaign and Russian officials during and after the 2016 election. The FBI and other U.S. intelligence agencies allege that a 2016 hacking of Democratic National Committee servers – which brought confidential e-mails into the hands of whistleblower site Wikileaks – was carried out on behalf of the Russian government to help the Trump campaign. In addition to the FBI and Justice Department, several congressional committees are looking into the matter to find out what Trump and his people knew about the Russian interference and when they knew it.