Donald Trump has denied a report alleging he made a promise to a foreign leader, which sparked a whistleblower's formal complaint. The complaint is reported to relate to a July phone call with Ukraine's new president, Volodymyr Zelensky. The Washington Post said an intelligence official found the comment "so troubling" they went to the department's inspector general. In a tweet, Mr Trump dismissed the claims as "fake news".
Democrats are trying to get the complaint turned over to Congress, with the details still unknown. However, some reports allege that Mr Trump asked Mr Zelensky to investigate Joe Biden and his son Hunter - who previously served on the board of a Ukrainian gas company - in return for continued US military support. Joe Biden is currently the frontrunner to be the Democratic candidate competing against Mr Trump in the 2020 presidential election.
