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 TrumpRealClearPolitics reporter says Freedom Caucus shows how much GOP changed under Trump Jake Ellzey defeats Trump-backed candidate in Texas House runoff DOJ declines to back Mo Brooks's defense against Swalwell's Capitol riot lawsuit 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 GiulianiDOJ declines to back Mo Brooks's defense against Swalwell's Capitol riot lawsuit Bob Dole: 'I'm a Trumper' but 'I'm sort of Trumped out' Ex-Trump adviser Barrack charged with secretly lobbying for UAE MORE]," Taylor said in the statement.

Burisma is the Ukrainian company Hunter Biden, the son of former Vice President Joe BidenJoe BidenRealClearPolitics reporter says Freedom Caucus shows how much GOP changed under Trump Iowa governor suggests immigrants partially to blame for rising COVID-19 cases Biden officials pledge to confront cybersecurity challenges head-on 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.