House Democrats on Friday unveiled new details in their impeachment investigation by releasing the interview transcripts from two national security officials who testified about 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’s contacts with Ukraine.

The release of the depositions — providing verbatim exchanges from last month's private interviews with 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 and Fiona Hill — cap a week in which Democrats have made public several witness transcripts in an effort to keep the attention on their impeachment inquiry even as multiple witnesses have refused to appear. The public phase of the probe is slated to begin next week.

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Vindman, a Ukraine specialist on the National Security Council (NSC), was a participant in the July 25 phone call between Trump and Ukrainian President Volodymyr Zelensky, when Trump pressed his counterpart to open investigations into Democrats — a move that would likely benefit Trump politically heading into the 2020 election.

Hill, who had served as Trump’s top Russia analyst at the NSC before leaving the post voluntarily over the summer, had also voiced concerns about the pressure campaign.

She was particularly leery of a pair of figures leading that campaign: Gordon Sondland, the U.S. ambassador to the European Union, and 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.

Testifying before House investigators on Oct. 14, she reportedly said that John Bolton John BoltonJudge appears skeptical of Bolton's defense of publishing book without White House approval Maximum pressure is keeping US troops in Iraq and Syria Woodward book trails Bolton, Mary Trump in first-week sales MORE, Trump’s former national security adviser, was up in arms over the Ukraine campaign. As a result, he instructed her to notify the NSC’s top lawyer about the administration's activities.

“I am not part of whatever drug deal Sondland and Mulvaney are cooking up,” Bolton reportedly told Hill.

House Democrats have now released eight transcripts this week from the closed-door depositions in their impeachment probe.

"Lt. Col. Vindman and Dr. Hill—two courageous and patriotic Americans—testified despite pressure by the White House to silence their testimony," the three chairs of the House committees leading the impeachment inquiry said in a joint statement Friday. "Their superiors in the White House have declined to cooperate with the inquiry, but transcripts released today show clearly that individuals close to the President were alarmed by a presidential scheme as illicit and corrupt as a ‘drug deal.’”

Trump earlier in the day lashed out at House Democrats for conducting the impeachment inquiry and for the next week's scheduled events.

"They shouldn’t be having public hearings. This is a hoax," Trump said at the White House.

The comments marked a sharp break from the his allies, who in recent weeks have argued the probe should be more transparent.

Updated at 12:57 p.m.