A top State Department official told House investigators behind closed doors Tuesday that he had raised concerns about Rudy Giuliani Rudy GiulianiThe Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting CIA found Putin 'probably directing' campaign against Biden: report Democrats fear Russia interference could spoil bid to retake Senate MORE’s contacts with Ukraine as early as March of this year, which prompted a supervisor to warn him to lay low, according to one Democrat present during the deposition.

Deputy Assistant Secretary of State George Kent testified for roughly 10 hours about efforts by 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 and Giuliani, his personal lawyer, to get Ukrainian President Volodymyr Zelensky to open a corruption investigation into one of his top political opponents, 2020 Democratic candidate 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.

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“What I can say is he was clearly bothered by the role Mr. Giuliani was playing and the disinformation he was spreading,” Rep. Gerry Connolly Gerald (Gerry) Edward ConnollyJudge issues nationwide injunction against Postal Service changes House panel advances bill to ban Postal Service leaders from holding political positions Shakespeare Theatre Company goes virtual for 'Will on the Hill...or Won't They?' MORE (D-Va.), a member of the House Oversight and Reform Committee, told reporters after leaving the gathering.

Connolly said Kent expressed concerns with what he described as an informal — and dangerous — alliance between three figures wrapped up in the Ukraine affair: Giuliani; Yuriy Lutsenko, Ukraine's former chief prosecutor; and John Solomon, a former opinion contributor at The Hill, who wrote a series of columns critical of the Bidens.

The three worked in concert, Kent testified, according to Connolly, on a mission to oust Marie Yovanovitch, the former U.S. ambassador to Ukraine who was removed in May, and press Ukrainian leaders to investigate the Bidens for the purpose of boosting Trump's reelection chances next year.

"There was this sort of ... unhealthy triad of Giuliani, Solomon and Lutsenko repeating and echoing each other, all based on disinformation," Connolly said, relaying Kent's message.

"Lutsenko had his own vendettas — one of which apparently was to get at our ambassador, to get her out of the way. And he persuaded Giuliani that she was a problem for him too. And then Giuliani then persuaded the president," he added.

"And it's sort of this unholy alliance — or unholy triad — that somehow managed to seize control of U.S. foreign policy with respect to Ukraine," Connolly continued. "And as [Kent] said, the consequence would [be to] undermine 28 years of our efforts to promote the rule of law by actually doing something corrupt ourselves."

A source familiar with the matter also said Kent testified that while the State Department viewed former prosecutor general Viktor Shokin as corrupt, Lutsenko was considered to be just as bad.

The Virginia Democrat also underpinned growing scrutiny of individuals who circumvented the proper channels for carrying out Ukraine policy, including 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, U.S. Ambassador to the European Union Gordon Sondland, and former U.S. special envoy to Ukraine Kurt Volker Kurt VolkerGOP senators request details on Hunter Biden's travel for probe Yovanovitch retires from State Department: reports Live coverage: Senators enter second day of questions in impeachment trial MORE.

Kent described a May 23 meeting, organized by Mulvaney, where “it was determined that ... responsibility for U.S.-Ukraine policy was to be transferred to three individuals: Volker, Sondland and [Energy Secretary] Rick Perry Rick PerryEnergy secretary questions consensus that humans cause climate change OVERNIGHT ENERGY: Democrats push resolution to battle climate change, sluggish economy and racial injustice | Senators reach compromise on greenhouse gas amendment stalling energy bill | Trump courts Florida voters with offshore drilling moratorium OVERNIGHT ENERGY: Trump signs major conservation bill into law | Senate votes to confirm Energy's No. 2 official | Trump Jr. expresses opposition to Pebble Mine project MORE,” Connolly said.

The group dubbed themselves “the three amigos,” Connolly continued, citing Kent.

“They revealed that decision at a meeting with Zelensky in Kiev, I believe on June 2,” Connolly said. “And for some Americans from the embassy, that was news to them."

Connolly was by far the most talkative participant in Tuesday’s deposition. Other Democrats left the gathering saying broadly that Kent’s testimony validates the whistleblower complaint but without providing details.

Connolly’s detailed accounts, meanwhile, drew ire from House Republicans, who amplified their previous attacks that the Democrats’ close-door impeachment strategy is undemocratic, denying the public a window into everything that’s said — even as some Democrats leak select details.

“While we can’t tell you anything that just happened, we get copies handed to us of Twitter feeds and how reports on substance are being put out,” said GOP Rep. Lee Zeldin Lee ZeldinDCCC reserves new ad buys in competitive districts, adds new members to 'Red to Blue' program Overnight Defense: House panel probes Pompeo's convention speech | UN council rejects US demand to restore Iran sanctions | Court rules against Pentagon policy slowing expedited citizenship The Hill's 12:30 Report: Republicans conduct in-person convention roll call MORE (R-N.Y.). But “then [Connolly] walks out, and he starts telling the public of what substantively happened behind closed doors. This is a disgusting strategy that has been on display.”

Republicans have loudly complained about the process, saying Democrats are selectively leaking favorable interview tidbits from closed-door hearings while failing to promptly release full transcripts of witness interviews — all complaints that Democrats similarly lodged when the GOP had majority power in the House last year.

Kent is one of several current and former administration officials who have defied White House orders not to testify, following Yovanovitch, who testified last Friday, and Russia expert Fiona Hill, who was deposed on Monday.

Sondland, after the administration blocked his testimony last week, is scheduled to testify before the committees on Thursday.