House Intelligence Committee chairman Adam Schiff has declared war on Vice President Mike Pence, barely a week after his panel finished its hearings on the impeachment of President Donald Trump.

As an impeachment vote loomed Wednesday, Schiff demanded Pence's office declassify documents that he claims could show the vice president knee-deep in the Ukraine scandal that has brought Trump to the brink.

Pence spoke September 18 with Ukrainian President Volodymyr Zelensky. The vice president's top Eur adviser Jennifer Williams heard the call and testified behind about it behind closed doors.

Williams' lawyers submitted supplemental written testimony to Schiff's committee just before Thanksgiving, but Pence declared it—and the contents of his call with Zelensky—classified.

House Intelligence Committee Chairman Adam Schiff demanded in a CNN interview on Wednesday that Vice President Mike Pence declassify information potentially pointing to his involvement in the Ukraine scandal that led to President Donald Trump's impeachment

Pence classified a call with Ukrainian President Volodymyr Zelensky, along with the closed-door testimony one of his aides gave the Intelligence Committee about it

Schiff blasted the decision Wednesday on CNN, saying it 'goes to the vice president's knowledge of this scheme,' a reference to Democrats' claims that Trump held more than $400 million in U.S. military aid hostage to a promise that Ukraine wwould announce a corruption probe of former Democratic Vice President Joe Biden.

'It should be declassified,' Schiff said of Williams' written account to Congress. 'It has nothing classified in it. It is not appropriate to classify something because it will conceal material that's either embarrassing or incriminating.'

The California Democrat said he is unlikely to release Williams' added testimony on his own, although there is ample precedent for Intelligence Committee chairman to do it.

'I would like to see the intelligence community declassify this if the vice president will not,' he told CNN.

Trump's impeachment is unlikely to see him bounced from the White House after the Republican-led U.S. Senate holds a trial.

President Donald Trump is likely to be impeached on Wednesday, and to easily survive a Senate trial

Pence adviser Jennifer Williams hasn't talked publicly about the VP's call with Zelensky

But in theory, both he and Pence could be removed from office by the same constitutional maneuver.

That would install Democratic House Speaker Nancy Pelosi in the Oval Office, following an order-of-soccession prescription in the U.S. Constitution.

Schiff said Wednesday that impeachment is 'a constitutional remedy meant for a president like him [Trump], who put his personal interests over the interest of the nation.'

'But this president believes he is the state,' Schiff jabbed, 'he can do no wrong, that under Article II, as he has said, he can do "anything he wants." Well, he can't. He's not a king. He's not our ruler. He's an elected president who can be removed for abusing his power.'