President Donald Trump reportedly instructed 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.

Trump on Monday defended the aid delay to Ukraine, saying he’d ordered the holdup because of concerns about corruption in Ukraine. The funds were finally transmitted on Sept. 11 after several months of delay, the Post reported.

“Why would you give money to a country that you think is corrupt?” Trump told reporters at a United Nations event, per The Wall Street Journal.

Trump later said the delay had not been employed as a tactic to pressure Zelensky.

“I put no pressure on them whatsoever,” Trump said, though quickly added: “I think it would probably, possibly have been OK if I did.”