President Donald Trump reportedlyinstructed his acting chief of staff, Mick Mulvaney, to delay more than $390 million in military aid to Ukraine. According to The Washington Post, Trump’s demand was made at least a week before his July 25 phone call with the Ukrainian president in which Trump allegedly urged Volodymyr Zelensky to dig up dirt on his potential election rival Joe Biden.

The call was reportedly part of a whistleblower complaint concerning Trump that was filed by someone working in U.S. intelligence. Joseph Maguire, the acting director of national intelligence, has refused to turn the complaint over to congressional oversight committees despite facing pressure from Democrats to do so.