READ: EU ambassador testifies as part of House impeachment inquiry

Gordon SondlandGordon SondlandTop Zelensky aide refutes Sondland testimony Mulvaney: 'Politics can and should influence foreign policy' Controversy on phone records intensifies amid impeachment 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 BidenThe Hill's Morning Report - Sponsored by AdvaMed - House panel expected to approve impeachment articles Thursday Democrats seek leverage for trial Democrats spend big to put Senate in play 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 TrumpThe Hill's Morning Report - Sponsored by AdvaMed - House panel expected to approve impeachment articles Thursday Democrats worried by Jeremy Corbyn's UK rise amid anti-Semitism Warren, Buttigieg duke it out in sprint to 2020 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 GiulianiThe Hill's Morning Report - Sponsored by AdvaMed - House panel expected to approve impeachment articles Thursday Horowitz offers troubling picture of FBI's Trump campaign probe Horowitz: 'Very concerned' about FBI leaks to Giuliani MORE as well as conversations with Trump.

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