The senior U.S. diplomat in Ukraine said Tuesday he was told release of military aid was contingent on public declarations from Ukraine that it would investigate the Bidens and the 2016 election, contradicting President Trump’s denial that he used the money as leverage for political gain.

Acting ambassador William B. Taylor Jr. testified behind closed doors in the House impeachment probe of Trump that he stands by his characterization that it was “crazy” to make the assistance contingent on investigations he found troubling.

Taylor walked lawmakers through a series of conversations he had with other U.S. diplomats who were trying to obtain what one called the “deliverable” of Ukrainian help investigating Trump’s political rivals.

Taylor said he spoke to Ambassador Gordon Sondland, the U.S. envoy to the European Union.

“During that phone call, Amb. Sondland told me that President Trump had told him that he wants President [Volodymyr] Zelensky to state publicly that Ukraine will investigate Burisma and alleged Ukrainian interference in the 2016 election,” Taylor said in the statement.