READ: EU ambassador testifies as part of House impeachment inquiry

Gordon SondlandGordon SondlandGOP chairman vows to protect whistleblowers following Vindman retirement over 'bullying' Top Democrat slams Trump's new EU envoy: Not 'a political donor's part-time job' Trump names new EU envoy, filling post left vacant by impeachment witness Sondland MORE, the U.S. ambassador to the European Union, told Congress on Thursday that he had no knowledge of the Trump administration allegedly withholding foreign aid in exchange for information on former Vice President Joe BidenJoe BidenMark Kelly clinches Democratic Senate nod in Arizona Hillicon Valley: NSA warns of new security threats | Teen accused of Twitter hack pleads not guilty | Experts warn of mail-in voting misinformation Biden offers well wishes to Lebanon after deadly explosion MORE or his son Hunter.

“Let me state clearly: Inviting a foreign government to undertake investigations for the purpose of influencing an upcoming U.S. election would be wrong," Sondland said in the closed-door hearing, according to his opening statement. "Withholding foreign aid in order to pressure a foreign government to take such steps would be wrong."

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Sondland, a key witness in the House's ongoing impeachment inquiry into President TrumpDonald John TrumpMark Kelly clinches Democratic Senate nod in Arizona Trump camp considering White House South Lawn for convention speech: reports Longtime Rep. Lacy Clay defeated in Missouri Democratic primary MORE, said he "did not and would not ever participate in such undertakings."

"In my opinion, security aid to Ukraine was in our vital national interest and should not have been delayed for any reason," he said. In his statement, Sondland also describes his participation in key meetings with Ukrainian President Volodymyr Zelensky and Trump attorney Rudy GiulianiRudy GiulianiNunes declines to answer if he received information from Ukraine lawmaker meant to damage Biden Democratic attorneys criticize House Judiciary Democrats' questioning of Barr Swalwell: Barr has taken Michael Cohen's job as Trump's fixer MORE as well as conversations with Trump.

Read Sondland's opening statement to the congressional committees below.