Donald Trump demanded Monday that a whistleblower whose warning about the US president's call with
Ukraine triggered the impeachment inquiry against him be identified and testify before Congress.
As the president menaced the person who exposed his potential wrongdoing, Trump faced a new setback with his former top
Russia advisor, Fiona Hill, sitting for a closed-door deposition Monday before Capitol Hill lawmakers.
Hill served in the National Security Council but left the administration shortly before Trump's July 25 call with his Ukrainian counterpart Volodymyr Zelensky.