Trump was alleged to have abused power by using a military aid that Congress approved to pressure Ukrainian President Volodymyr Zelensky into investigating former U.S. Vice President Joe Biden, the leading 2020 Democratic presidential candidate, so as to help his re-election campaign.

The White House has said it will not provide documents or witnesses to House investigators because it considered the impeachment inquiry unfair and illegitimate.

Democrats have argued that there is no need to hold a full House vote to authorize the inquiry, citing Constitution stating that the lower chamber "shall have the sole Power of Impeachment."

Trump has denied any wrongdoing and has urged more efforts from Republicans to defend him and challenge the impeachment inquiry, as depositions are turning to the White House and a series of witnesses have testified behind closed doors before House panels leading the investigation.

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