The President's men, the Vice President's son and a single phone call: the real story of what happened in Ukraine and why it led to impeachment hearings. As the rumors and accusations surrounding President Trump's involvement in Ukraine started to swirl, NBC's Chief Foreign Correspondent Richard Engel travelled to Ukraine to talk to the key players on the ground to tell the story of why the Ukrainian prosecutor investigating Joe Biden's son was really fired. Engel and his team in Ukraine secured the first broadcast interview with the man central to the story - the Ukrainian former Prosecutor Yuri Leshenko. He revealed that President Trump's personal lawyer Rudy Giuliani was applying pressure for an investigation to be reopened, in an apparent attempt to dig for dirt on a political rival. He told NBC exclusively that far from being a one-off conversation, the two had spoken around ten times. This information was picked up and widely reported by other media.