The impeachment inquiry was prompted by a whistleblower complaint filed in late August alleging that Trump pressured Zelensky to investigate Biden and his son Hunter, whom Trump accused of involvement in a corruption case in Ukraine.

Pelosi and three House committees leading the impeachment inquiry -- Intelligence, Oversight and Reform and Foreign Affairs -- believe Trump's conversation with Zelensky, as well as administration officials' interactions with the Ukrainian authorities before and after the call, manifested "efforts to pressure foreign powers to intervene in the 2020 elections."

Trump has denied wrongdoing, insisting that the call was "perfect" and calling the impeachment inquiry "another witch hunt" against him. The White House also considers the impeachment proceedings illegitimate, citing the absence of a full House vote.

Hunter served on the board of Burisma Holdings, a Ukrainian gas company, while his father oversaw U.S. policy on Ukraine as vice president. Both have denied wrongdoing.

A Fox News Poll released last week saw over half of U.S. respondents support impeachment, a noticeable increase from 42 percent in July.

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