READ: EU ambassador testifies as part of House impeachment inquiry

Gordon SondlandGordon SondlandOfficial testifies that Bolton had 'one-on-one meeting' with Trump over Ukraine aid READ: Top NSC aide Tim Morrison's closed-door impeachment inquiry testimony Top NSC aide puts Sondland at front lines of Ukraine campaign, speaking for Trump 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 BidenBudget official says he didn't know why military aid was delayed: report Growing 2020 field underscores Democratic divide READ: Foreign service officer Jennifer Williams' closed-door testimony from the House impeachment inquiry 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 TrumpGOP divided over impeachment trial strategy Official testifies that Bolton had 'one-on-one meeting' with Trump over Ukraine aid Louisiana governor wins re-election 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 GiulianiGrowing 2020 field underscores Democratic divide Top NSC aide puts Sondland at front lines of Ukraine campaign, speaking for Trump Bloomberg, Patrick take different approaches after late entries into primary race MORE as well as conversations with Trump.

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