Ex-top Trump Russia aide to testify about 'shadow policy' on Ukraine: report

President TrumpDonald TrumpSenators introduce bipartisan infrastructure bill in rare Sunday session Gosar's siblings pen op-ed urging for his resignation: 'You are immune to shame' Sunday shows - Delta variant, infrastructure dominate MORE's former top assistant working on European and Russian issues will reportedly testify to Congress that Trump's top lawyer, Rudy GiulianiRudy GiulianiCapitol insurrection hearing exposes Trumpworld delusions DOJ declines to back Mo Brooks's defense against Swalwell's riot lawsuit Bob Dole: 'I'm a Trumper' but 'I'm sort of Trumped out' MORE, and his associates set up a shadow foreign policy for the Trump administration relating to Ukraine that circumvented the National Security Council (NSC).

NBC News reported Thursday that Fiona Hill, a former special assistant to the president, will tell House lawmakers that Giuliani and Trump's ambassador to the European Union, Gordon Sondland, went around the NSC and official White House procedures to speak to the president about Ukraine.

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Hill's attorney did not immediately return a request for comment from The Hill.

Her impending testimony is said to have caused worry in the White House, as Hill's tenure as one of Trump's top advisers stretches to the earliest months of his presidency.

Hill left the Trump administration in June after serving under two national security advisers, H.R. McMaster and John BoltonJohn BoltonWant to evaluate Donald Trump's judgment? Listen to Donald Trump Will Pence primary Trump — and win? Bolton: Trump lacked enough 'advance thinking' for a coup MORE, the latter of whom was ousted from the Trump administration last month.

Considered by many to be a top expert on Russian President Vladimir PutinVladimir Vladimirovich PutinIs Ukraine Putin's Taiwan? Democrats find a tax Republicans can support Biden officials pledge to confront cybersecurity challenges head-on MORE, Hill is the first former White House official to agree to comply with House Democrats' impeachment inquiry.

The probe was launched in response to a controversial conversation between the president and Ukraine's President Volodymyr Zelensky during which Trump pressed Zelensky to investigate former Vice President Joe BidenJoe BidenGOP report on COVID-19 origins homes in on lab leak theory READ: The .2 trillion Infrastructure Investment and Jobs Act Senators introduce bipartisan infrastructure bill in rare Sunday session MORE, a top 2020 Democratic contender for president.

The White House has opted to use executive privilege to stop officials from testifying before Congress, but it remains legally unclear if the president can force former officials who are now private citizens from testifying.