READ: EU ambassador testifies as part of House impeachment inquiry

Gordon SondlandGordon SondlandDemocrats see Mulvaney as smoking gun witness at Trump trial Schumer: Trump's team made case for new witnesses 'even stronger' Trump legal team launches impeachment defense 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 BidenDes Moines Register endorses Elizabeth Warren as Democratic presidential nominee Sanders faces lingering questions about appeal to women voters George Conway: Witness missing from impeachment trial is Trump 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 TrumpKaine: Obama called Trump a 'fascist' during 2016 campaign Kaine: GOP senators should 'at least' treat Trump trial with seriousness of traffic court Louise Linton, wife of Mnuchin, deletes Instagram post in support of Greta Thunberg 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 GiulianiDemocrats see Mulvaney as smoking gun witness at Trump trial Pompeo lashes out at 'shameful' NPR reporter Trump legal team launches impeachment defense MORE as well as conversations with Trump.

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