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 second-term plans remain a mystery to GOP Trump to hold outdoor rally in New Hampshire on Saturday Eighty-eight years of debt pieties 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 GiulianiOusted Manhattan US Attorney Berman to testify before House next week Sunday shows preview: With coronavirus cases surging, lawmakers and health officials weigh in Hillicon Valley: Democrats introduce bill banning federal government use of facial recognition tech | House lawmakers roll out legislation to establish national cyber director | Top federal IT official to step down MORE]," Taylor said in the statement.

Burisma is the Ukrainian company Hunter Biden, the son of former Vice President Joe BidenJoe BidenTrump second-term plans remain a mystery to GOP Susan Rice: Trump picks Putin over troops 'even when it comes to the blood of American service members' Does Donald Trump even want a second term? 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.