President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE's ambassador to the European Union, Gordon Sondland, plans to tell Congress this week that a text he sent denying a quid pro quo between Trump and Ukrainian President Volodymyr Zelensky in a July phone call was dictated by Trump himself.

The Washington Post reported Saturday that a source familiar with the ambassador's planned testimony told the newspaper that Sondland plans to testify that Trump told him in a phone conversation to tell the acting ambassador to Ukraine that he didn’t "want a quid pro quo … didn’t want anything from Ukraine" in exchange for military aid.

ADVERTISEMENT

Regarding whether that is actually true, the person said, Sondland will not take an opinion and instead will tell lawmakers that he worked at the direction of Trump's lawyer Rudy Giuliani Rudy GiulianiThe Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting CIA found Putin 'probably directing' campaign against Biden: report Democrats fear Russia interference could spoil bid to retake Senate MORE to secure a statement from Ukraine's government confirming a criminal investigation into former Vice President Joe Biden Joe BidenFormer Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick Bloomberg rolls out M ad buy to boost Biden in Florida MORE.

Trump and his allies have defended their efforts to persuade Ukraine to launch the investigation by insisting that the White House did not order the Pentagon to hold up millions of dollars in military aid to the country on the condition of an investigation being launched.

Democrats have argued that such a quid pro quo did exist and that Trump abused the powers of the presidency by approaching Ukraine's government about launching such an investigation.

Sondland is expected to testify before three House committees on Thursday, defying an order from the State Department not to comply with Democrats' impeachment inquiry.

"Ambassador Sondland believes strongly that he acted at all times in the best interests of the United States, and he stands ready to answer the Committee’s questions fully and truthfully," his attorney said in a statement this week.

This report was updated on Oct. 13 at 6:28 a.m.