Vice President Mike Pence Michael (Mike) Richard PenceFormer Pence aide: White House staffers discussed Trump refusing to leave office Pence vows for law and order everywhere Trump met with chants of protest as he pays respects to Ruth Bader Ginsburg MORE on Sunday morning said he was not aware of any quid pro quo in relation to the White House’s hold on military aid to Ukraine, but demurred on whether the officials who have testified on the issue are lying.

“I can only tell you what I know...what I know is the transcript shows there was no quid pro quo in all of my interactions with [Ukrainian] President [Volodymyr] Zelensky,” Pence said on CBS’s “Face the Nation.”

Pressed by host Margaret Brennan about the House witnesses, including U.S. diplomats Bill Taylor and Gordon Sondland, who have alleged there was a quid pro quo, Pence insisted White House discussions with Zelensky had focused on efforts to stem corruption in Ukraine, Russia’s invasion of Crimea and the need for Europe to “step up.”

UKRAINE CONTROVERSY: “I can only tell you what I know...what I know is the transcript shows there was no quid pro quo in all of my interactions with President Zelensky," @VP tells @margbrennan of @realdonaldtrump 's controversial call with Ukraine's president. pic.twitter.com/dOfhdUCakE — Face The Nation (@FaceTheNation) October 27, 2019

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“I’m telling you that all of my interactions with the [Ukrainian] president were entirely focused on issues of importance to the American people,” Pence added.

The allegations of a quid pro quo are at the center of the House’s impeachment inquiry into President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE. Earlier this month, acting White House Chief of Staff Mick Mulvaney Mick MulvaneyOn The Money: House panel pulls Powell into partisan battles | New York considers hiking taxes on the rich | Treasury: Trump's payroll tax deferral won't hurt Social Security Blockchain trade group names Mick Mulvaney to board Mick Mulvaney to start hedge fund MORE seemingly confirmed that the aid was delayed in part in an attempt to pressure Zelensky to investigate possible Ukrainian interference in the 2016 U.S. presidential election. He walked back that assertion hours later.

A whistleblower alleges Trump used the aid to pressure the Ukraine leader to investigate former Vice President Joe Biden Joe BidenFormer Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick Bloomberg rolls out M ad buy to boost Biden in Florida MORE and his son.