( CNN) The fast-moving scandal involving President Donald Trump and allegations that he pressured Ukrainian President Volodymyr Zelensky to investigate his political contender Joe Biden and his son, Hunter, has upended politics in Washington, DC, and turned Democrat toward an impeachment investigation. There is no evidence that either Biden did anything wrong.
Who's Who: Meet the key players
Visual timeline of the Ukraine scandal
READ: The whistleblower grievance, annotated
READ: Trump's July 25 bellow with the Ukraine president, annotated
An anonymous government worker – with access to White House officials – who filed an official complaint against the President claiming that multiple officials had concerns that Trump was using his public office to seek personal political gain from a foreign power not just through his July 25 phone conversation with Zelensky but through emissaries including Trump's lawyer, Rudy Giuliani, as well as, possibly, Attorney General Bill Barr. The complaint also alleges a coverup by White House staffers who sought to bury Trump's conversation with the Ukrainian President by put a rough transcript of it in a computer system reserved for highly classified material.
Donald Trump, President of the United States
Just as he was trying to move on from accusations his campaign colluded with Russians against Hillary Clinton in 2016, Trump was ramping up efforts to get Ukraine to stir up trouble for his prospective 2020 challenger Biden. He employed official channels to ask the Ukrainian President to look into the Biden family, openly asking Zelensky for a favor during a phone call on July 25 and then suggested his attorney meet with Ukrainian officials. In the July 25 phone call, the Ukrainian President mentioned plans to buy US-made Javelin missiles — which he needs to help guard against potential Russian provocations. At the very same time, Trump was sitting on nearly $400 million in aid to Ukraine, which he has argued was on hold while he leaned on European countries to give more to Ukraine.
Volodymyr Zelensky, President of Ukraine
A comedian turned politician, Zelensky's job before being elected the President of Ukraine was playing the President of Ukraine on television. His country is in the midst of a years-long standoff with Russia over Crimea, an area Russia invaded and annexed in 2014. Zelensky is also dealing with a war against pro-Russian separatists. But his intentions — and whether he is pro-Russian or pro-West — have been something both sides have been trying to determine. His desire for military aid from the US is unquestioned. He flattered Trump during their phone call in July and promised a fair look at the Biden family after Trump asked for an investigation. But Zelensky clearly does not want to get involved in US politics, and said after the White House released its transcript of the July 25 call that he didn't believe his side would be included.
Rudy Giuliani, Trump attorney
The former New York mayor , now the President's personal lawyer and staunch defender on cable news, is at the center of the Ukraine scandal. He has said he went to Ukraine because was trying to undermine the beginnings of the Russia investigation and protect Trump's former campaign chairman Paul Manafort, who is currently in prison for tax fraud linked to his business dealings in Ukraine. Giuliani has said he then pivoted after learning about claims concerning Joe Biden's actions as Vice President, including his public calls in 2016 for a prosecutor in Ukraine to be fired. Giuliani claims that was improper because, at the time, Biden's son sat on the board of a Ukrainian company that had once been under investigation in Ukraine. After pushing the story about Biden for months, Giuliani ultimately met with a top aide to Zelensky in Madrid, days after the July 25 phone call where Trump asked Zelensky to hear Giuliani out.
William Barr, US attorney general
Barr took over as head of the Department of Justice in February 2019, and supervised the official release of the Mueller report summing up the government's investigation into claims that Russia engaged with the Trump campaign to tamper with the 2016 election. Trump asked the Ukrainian President to talk with Barr as part of an investigation he said Barr was conducting. Barr has remained quiet about any involvement in Ukraine, but Democrats have said they expect him to be called to testify.
