The chairmen of the House Oversight, Intelligence, and Foreign Affairs committees have sent a letter to Fiona Hill, President Trump's former adviser on Russia, asking that she appear for a deposition on Oct. 14.
The letter, obtained by Axios, was sent on Wednesday, and also requests that Hill hand over specific documents dating back to January 2017. Hill left the administration in August, but most of her work was completed by mid-July, Axios reports, so it's unclear how much she knows about Trump's July 25 phone call with Ukrainian President Volodymyr Zelensky.
During the call, Trump pushed Zelensky to open an investigation into former Vice President Joe Biden, and it was this conversation that sparked the whistleblower complaint that led to the House launching an impeachment inquiry against Trump. Hill is a critic of Russian President Vladimir Putin, Axios reports, and served under former National Security Advisers H.R. McMaster and John Bolton on the National Security Council.