A top diplomat to Ukraine told House investigators Tuesday that he believed the Trump administration withheld aid to Ukraine in an effort to get Ukrainian President Volodymyr Zelensky to launch politically motivated investigations, according to his opening statement and multiple sources familiar with his testimony.

William Taylor, who serves as the chargé d’affaires for Ukraine, in meticulous detail laid out in his lengthy 15-page opening statement what he viewed as 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 withholding roughly $400 million in financial aid until he secured commitment from Ukraine that they were investigating one of his top political rivals, 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.

The top diplomat, who spent nearly 10 hours behind closed doors, tied Trump officials like personal attorney 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; U.S. Ambassador to the E.U. Gordon Sondland; then-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; 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 to a secretive shadow foreign policy campaign that sought to obtain a public statement about investigations into the 2016 presidential election and Burisma, a Ukrainian energy company that employed former Biden’s son, Hunter. His statements counter the claims made by the president and his defenders arguing the aid was not used as leverage.

ADVERTISEMENT

“[T]he push to make President Zelensky publicly commit to investigations of Burisma and alleged interference in the 2016 election showed how the official foreign policy of the United States was undercut by the regular efforts led by Mr. Giuliani,” he told House investigators.

Taylor relayed that he heard from Tim Morrison, a top Ukraine expert on the National Security Council (NSC), who described a “sinking feeling” in early September that resulted from Trump telling Sondland there was no “quid pro quo,” all while continuing to insist that Zelensky should publicly announce that he is “opening investigations of Biden and the 2016 election interference, and that President Zelensky should want to do this himself.”

Sondland, who continued to insist there was no quid pro quo, said later that the U.S. and Ukraine would be in a “stalemate” if Zelensky did not follow through with the public statement, according to Taylor’s statement.

“During our call on September 8, Ambassador Sondland tried to explain to me that President Trump is a businessman. When a businessman is about to sign a check to someone who owes him something, he said, the businessman asks that person to pay up before singing the check,” Taylor told investigators.

Taylor said that he pressed Sondland to push back on Trump’s demands for investigations, worrying it would hurt the U.S. relationship with the country. Sondland, Taylor recalled, later admitted he had made a mistake by insisting Zelensky make a public announcement about the probes.

“Ambassador Sondland also told me that he now recognized that he had made a mistake by earlier telling the Ukrainian officials to whom he spoke that a White House meeting with President Zelensky was dependent on a public announcement of investigations — in fact, Ambassador Sondland said ‘everything’ was dependent on such an announcement, including security assistance,” the opening statement continues.

ADVERTISEMENT

Taylor also said he learned from two other officials that the order to hold security assistance for Ukraine came from 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, who they said still had “maintained a skeptical view of Ukraine.”

In his testimony, Taylor described two channels “of U.S. policy-making and implementation — one regular and one highly irregular, and that he realized the two channels diverged in terms of their mission in August.

Multiple sources familiar with Taylor’s testimony said it was clear he was considered there was a quid pro quo with the aid, something the White House strongly pushed back on later Tuesday.

“President Trump has done nothing wrong — this is a coordinated smear campaign from far-left lawmakers and radical unelected bureaucrats waging war on the Constitution. There was no quid pro quo,” White House press secretary Stephanie Grisham Stephanie GrishamIvana Trump on Melania as first lady: 'She's very quiet, and she really doesn't go to too many places' The Hill's 12:30 Report: Trump uses White House as campaign backdrop Coronavirus tests not required for all Melania Trump speech attendees: report MORE said in a statement Tuesday. “ Today was just more triple hearsay and selective leaks from the Democrats’ politically-motivated, closed door, secretive hearings.”

Most Democrats emerging Tuesday from Taylor’s closed-door testimony in the Capitol basement were tight-lipped on details but effusive on a central point: the ambassador, they said, was delivering the most damning testimony yet in the Democrats' impeachment investigation into President Trump.

"Without question the most powerful testimony we've heard," said Rep. Stephen Lynch Stephen Francis LynchOvernight Defense: Pentagon redirects pandemic funding to defense contractors | US planning for full Afghanistan withdrawal by May | Anti-Trump GOP group puts ads in military papers Official: Pentagon has started 'prudent planning' for full Afghanistan withdrawal by May Overnight Defense: Dems divided on length of stopgap spending measure | Afghan envoy agrees to testify before House panel | Trump leans into foreign policy in campaign's final stretch MORE (D-Mass.), who sits on the Oversight Committee.

"This testimony is a sea change. I think it could accelerate matters," Lynch continued. "This will, I think, answer more questions than it raises."

Some Republicans, however, described Taylor's testimony as an official putting his "interpretation" on the Ukraine contacts. While others highlighted that Taylor heard many of these matters from other officials, making his knowledge of events second hand.

"If they think this is anything dramatic, it is just nonsense," said Rep. Chris Stewart Christopher (Chris) Douglas StewartAtlanta Wendy's 911 call the night of Rayshard Brooks's death released Tyler Perry offers to pay for funeral of Rayshard Brooks Current, former NHL players form diversity coalition to fight intolerance in hockey MORE (R-Utah), a senior Republican on the House Intelligence Committee. "There was nothing in this, nothing at all. It was his interpretation of what we already know."

Taylor was among the State Department veterans who had raised red flags about the White House campaign, led by Trump’s personal lawyer, Giuliani, to pressure Zelensky for political favors. The Democrats’ impeachment inquiry is now focused squarely on that episode.

In text message conversations with several other diplomats, including Sondland, Taylor last month had warned against the “crazy” strategy of withholding U.S. aid “for help with a political campaign." Taylor confirmed in his opening remarks that he seriously considered quitting in protest of the Trump administration’s policy towards Ukraine, a threat he made in the text message thread with Sondland and Volker.

Sondland, a wealthy hotel magnate and Trump donor with no previous diplomatic experience, pushed back, saying Taylor was "incorrect" in surmising Trump's intentions.

ADVERTISEMENT

"The president has been crystal clear no quid pro quos of any kind," Sondland wrote.

Sondland had testified last week before the three House committees leading the Democrats’ impeachment inquiry: Intelligence, Oversight and Foreign Affairs. But based on Taylor’s testimony Tuesday, some Democrats are already suggesting Sondland will be called back to explain apparent discrepancies.

“I walk away with the impression Mr. Sondland will have some explaining to do,” said Rep. Raja Krishnamoorthi Subramanian (Raja) Raja KrishnamoorthiCDC causes new storm by pulling coronavirus guidance Democratic chairman says White House blocked Navarro from testifying Democrats urge CDC to update guidance to encourage colleges, universities go tobacco-free MORE (D-Ill.), a member of the Intelligence Committee.

Lynch described Taylor as a "meticulous" note-taker who had kept detailed records of his involvement in the months-long effort by Trump and some of his closest allies to pressure Ukrainian leaders to find dirt on Trump's political rivals.

"He indicated that he kept extensive notes on all of this," Lynch said.

Rep. Tom Malinowski Thomas (Tom) MalinowskiDCCC reserves new ad buys in competitive districts, adds new members to 'Red to Blue' program The Hill's Morning Report - Presented by Facebook - First lady casts Trump as fighter for the 'forgotten' Hillicon Valley: Lawmakers introduce resolution condemning QAnon | US Cyber Command leader vows to 'defend forward' in protecting nation from cyberattacks MORE (D.N.J.), a member of the Foreign Affairs Committee, also suggested Taylor's testimony was supportive of the central allegations facing Trump on his dealings with Ukraine.

ADVERTISEMENT

"I would say it certainly filled in many of the remaining gaps in the narrative," Malinowski said. "I would say he remembered some things that previous witnesses have not been able to remember."

Democrats participating in the deposition said Taylor has also stood by his earlier statement that it would be “crazy” to leverage the U.S. financial assistance — which aimed to combat Russian aggression in Ukraine — to win a commitment from Zelensky to open such investigations.

“His testimony was withering with respect to some earlier testimony,” said Lynch.

Scott Wong contributed to this report which was updated at 7:42 p.m.