The No. 2 official at the Pentagon on Wednesday insisted he was not seeking to block the testimony of another senior Pentagon official when he sent her lawyer a letter outlining the Trump administration’s objections to the impeachment inquiry.

During an unrelated Senate Armed Services Committee hearing on the Pentagon’s recently completed audit, Democrats pushed Deputy Defense Secretary David Norquist on protections the department is providing for witnesses in the impeachment inquiry.

Pressed by Sen. Mazie Hirono Mazie Keiko HironoManchin defends Supreme Court candidate Barrett: 'It's awful to bring in religion' Democrats shoot down talk of expanding Supreme Court Democrats unveil plan declaring racism a public health issue MORE (D-Hawaii) on a letter he sent to the lawyers for Laura Cooper, the deputy assistant secretary of Defense for Russia, Ukraine and Eurasia, ahead of her closed-door deposition last month, Norquist said he “did not prohibit her” from testifying

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“I forwarded to her lawyer the information we had received from the White House that expressed their views about the impeachment process,” Norquist said. “One of the challenges, we wouldn't be able to send a lawyer with her. I wanted her to have that available information.”

“We understand each of the individuals are making their own decision,” he added.

Cooper is scheduled to testify publicly before the House Intelligence Committee later Wednesday after testifying behind closed doors in October.

The Pentagon, like other departments in the executive branch, has defied subpoenas related to the impeachment inquiry following a White House counsel letter declaring the administration would not comply with the probe.

The day before Cooper’s closed-door testimony, Norquist sent her lawyer a letter highlighting the White House direction not to participate in the inquiry.

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At Wednesday’s Armed Services Committee hearing, Hirono told Norquist that the letter “does create a chilling effect.”

“My only point is I would have felt it inappropriate to not have the lawyer be aware of this information, and so that's why we shared it,” Norquist replied. “So what we tried to do is set the right tone in the letter.”

Democrats' use of the Pentagon audit hearing to press Norquist on protecting witnesses in the impeachment inquiry comes after Senate Minority Leader Charles Schumer Chuck SchumerPelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' 3 reasons why Biden is misreading the politics of court packing Cruz blocks amended resolution honoring Ginsburg over language about her dying wish MORE (D-N.Y.) sent the Pentagon a letter Monday on the same issue.

In addition to Cooper, Democrats have expressed concern about protections for Army Lt. Col. Alexander Vindman Alexander VindmanImpeachment witness Alexander Vindman calls Trump Putin's 'useful idiot' The Hill's Morning Report - Sponsored by The Air Line Pilots Association - Trump, Biden renew push for Latino support Strzok: Trump behaving like an authoritarian MORE, the National Security Council’s top Ukraine expert.

Vindman testified during Tuesday’s public impeachment hearing before the House Intelligence Committee. Ahead of the hearing, reports surfaced that the Army is prepared to move Vindman and his family to a secure location if they are found to be in danger due to his testimony.

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Pressed by Sen. Tim Kaine Timothy (Tim) Michael KaineTrump plans to pick Amy Coney Barrett to replace Ginsburg on court Hillicon Valley: Subpoenas for Facebook, Google and Twitter on the cards | Wray rebuffs mail-in voting conspiracies | Reps. raise mass surveillance concerns Democrats call for declassifying election threats after briefing by Trump officials MORE (D-Va.) on those reports, Norquist would not discuss specific security measures.

“But we do take it very seriously, and we expect people to be responsive and truthful in their dealings with Congress,” Norquist added.

Kaine then urged Norquist to be “very diligent” in protecting members of the military cooperating with Congress.

“I think that your words delivered here should hopefully give some assurance and some confidence to some who are very, very worried,” Kaine said. “And I know they're worried because their families are calling my office. They're my constituents, and they're nervous about what might happen to them. You're giving them that assurance publicly. It means something to them.”