Former U.S. special envoy for Ukraine Kurt Volker Kurt VolkerGOP senators request details on Hunter Biden's travel for probe Yovanovitch retires from State Department: reports Live coverage: Senators enter second day of questions in impeachment trial MORE told House investigators Thursday he warned 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 personal 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 that his Ukrainian sources alleging wrongdoing by 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 and his son Hunter were not credible, according to The Washington Post.

Volker testified that he attempted to convince Giuliani that his sources, including the nation’s prosecutor general, were providing unreliable information, according to the Post, citing two people familiar with the testimony.

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Volker also said he and other officials within the State Department warned Ukrainian officials against involvement with U.S. politics, saying their involvement could open them to allegations of election interference, according to the Post.

Volker was summoned after he was named in a whistleblower complaint that led to an impeachment inquiry against Trump as the official who arranged a meeting between Giuliani and Ukrainian President Volodymyr Zelensky. Volker resigned shortly after the revelation of the complaint and a summary of a July call between Trump and Zelensky.

The report came shortly after Rep. Jim Jordan James (Jim) Daniel JordanHouse panel pulls Powell into partisan battles over pandemic Sunday shows preview: Justice Ginsburg dies, sparking partisan battle over vacancy before election House passes resolution condemning anti-Asian discrimination relating to coronavirus MORE (R-Ohio), one of Trump’s staunchest allies in the House, told reporters outside the closed-door session that “nothing he has said supports the narrative you’ve been hearing from [House Intelligence Committee Chairman Adam] Schiff [D-Calif.] and the Democrats.”

The report comes the same day Volker provided encrypted texts to Congress with Kiev chargé d'affaires Bill Taylor in which Taylor reportedly told other diplomats "it's crazy to withhold security assistance for help with a political campaign” even as the White House has denied it made the aid contingent on Ukraine launching an investigation.