The unnamed whistleblower claiming President Trump pressured Ukraine to investigate a political rival with the threat of withholding aid not only is a politically biased, registered Democrat, he or she has a significant tie to a 2020 Democratic presidential candidate.

Byron York reports at the Washington Examiner, citing three sources, that under questioning from Republicans during an impeachment inquiry interview last Friday, Intelligence Community Inspector General Michael Atkinson "told lawmakers that the Trump-Ukraine whistleblower had a working relationship with one of the current 2020 Democratic presidential candidates."

The IC inspector general told lawmakers that the Trump-Ukraine whistleblower had a working relationship with one of the current 2020 Democratic presidential candidates, according to three sources with knowledge of the testimony. https://t.co/YwNrz4SaE8 — Byron York (@ByronYork) October 8, 2019

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York reported his sources said Atkinson did not identify the Democratic candidate.

"Republicans will want to know more about the origins of the whistleblower complaint, especially given the unorthodox use of whistleblower law involved," York wrote. "There is more to learn — like who the Democratic candidate is — before Republicans will say they know enough about what happened."

A second whistleblower has contacted authorities, but Trump's lawyers say that person's opinion is irrelevant, since the July 25 telephone call between Trump and Ukrainian President Volodymyr Zelensky is available to the public.

The original anonymous whistleblower already has been confirmed as a member of the team investigating Trump and his relationship with Ukraine during the 2016 election, according to investigative reporter Paul Sperry.

The whistleblower has been described as a CIA officer working in the Obama White House who may begrudge Trump's election victory after losing his or her job when Trump became president.

Sperry reported the Democratic whistleblower "who complained about Trump digging up dirt in Ukraine was himself helping dig up dirt in Ukraine" against Trump and one-time campaign chairman Paul Manafort while working in the Obama White House during 2016 campaign," he wrote.

Sperry tweeted that there are rumors that the whistleblower was one of former CIA director and current NBC analyst John Brennan's "old CIA humps detailed over to — planted inside — the White House to spy on Trump and help thwart the investigation" of the origins of the Obama administration's false claim of Trump-Russia collusion, its spying on the Trump campaign and its "skullduggery in Ukraine."