READ: Diplomat describes pressure put on Ukraine to open 'investigations'

The top U.S. diplomat in Ukraine told Congress on Tuesday that he believed President TrumpDonald John TrumpTrump's newest Russia adviser, Andrew Peek, leaves post: report Hawley expects McConnell's final impeachment resolution to give White House defense ability to motion to dismiss Trump rips New York City sea wall: 'Costly, foolish' and 'environmentally unfriendly idea' MORE tied Ukrainian aid to requests for politically motivated "investigations." 

In the statement, made behind closed doors to three House committees, William Taylor described "an irregular, informal channel of U.S. policymaking with respect to Ukraine" that he called "separate and at odds" with his own "regular" diplomatic channel.

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"The push to make [Ukrainian President Volodymyr Zelensky] publicly commit to investigations of Burisma and alleged interference in the 2016 election showed how the official foreign policy of the United States was undercut by the irregular efforts led by [Trump's personal attorney Rudy GiulianiRudy GiulianiDemocrats file brief against Trump, 'the Framers' worst nightmare' Trump lawyers attack House impeachment as 'brazen and unlawful' effort to overturn 2016 results Sunday shows preview: Lawmakers gear up for Senate impeachment trial MORE]," Taylor said in the statement.

Burisma is the Ukrainian company Hunter Biden, the son of former Vice President Joe BidenJoe BidenBiden alleges Sanders campaign 'doctored video' to attack him on Social Security record Sanders campaign responds to Biden doctored video claims: Biden should 'stop trying to doctor' public record Capt. "Sully" Sullenberger pens op-ed in defense of Biden: 'I stuttered once, too. I dare you to mock me' MORE, formerly advised.

"I understood a 'stalemate' to mean that Ukraine would not receive the much-needed military assistance," Taylor added regarding U.S. efforts he described to pressure Zelensky to agree to such investigations.

Read Taylor's opening statement below.