Taylor, a former retiree ambassador to Ukraine and state foreign policymaker, exchanged text messages with two other diplomats calling him "crazy to refuse security assistance for political campaign assistance" and "nightmare scenario." "
Taylor did not comment when he arrived at the Capitol Hill on what was expected to be several hours of closed-door testimony.
An impeachment investigation official said on Tuesday that Taylor was testifying after a State Department subpoena.
"The House Intelligence Committee issued a summons to coerce his testimony this morning," said the official, who requested anonymity to discuss the arrangements. "As requested, Ambassador Taylor he also complied with the call and answered questions from both Democratic and Republican members and officials. "
Rep. Ami Bera (D-Calif.), a member of the House Foreign Affairs Committee, told CNN that Taylor was "outspoken" but did not provide details of his morning testimony.
"He fills in some gaps," Bera said, adding that Taylor's resume made it difficult for Republicans and the White House to take advantage of its credibility.
"His memory and memory look much better than that of Ambassador Sundland," Bera said, referring to Trump's donor and European Union ambassador Gordon Sundland, who appeared before the committees last week.
House of Majority Whip James E. Cliburn (DS.C.) said it planned to discuss Trump's tweet with the Congress of the Black Caucasus and left open the possibility of voting in one place condemning Trump's characterization.
"I express it extremely," said Claiber. "I think what we're seeing here again is the president trying to change the story, using what I consider to be truly heuristic terms to change the conversation. Comparing the constitutional process to something like lynching is far below the office of the President of the United States. "
Taylor's testimony may fill some of the blanks for the activities of US officials who appear to have sought Ukrainian assistance at the request of Trump and his personal lawyer Rudolf W. Giuliani Jr., although it was not clear how much Taylor knew.
The question is whether the White House has conditioned military aid and a meeting between the two presidents on the co-operation of Ukrainian President Vladimir Zelensky. [1
9659002] Taylor agreed to go to Kiev as deputy ambassador, as he believes US-Ukraine relations are at a critical juncture after Zelensky's election last spring, other diplomats said.
Taylor wants to strengthen US support for Zelensky's anti-corruption. The program and its independence from Russia have been said by people who know Taylor.
He also told friends that he was worried that the relationship would be broken after he forced her to recall former ambassador Marie Jovanovic and made it clear within the State Department that he objected to her attitude, former administration staff.
Taylor is a potentially damaging witness to Trump as he appears to have no political or personal incentive to defend the administration. Unlike other State Department witnesses, he has neither his government career nor his personal position with Trump at stake.
Although Taylor was not expected to bring any additional documents with him on Tuesday, he is already recording objections to what Democrats say was an effort to pressure Zelensky to investigate former Vice President Joe Biden and his son of Hunter. Joe Biden is the Democratic presidential candidate in 2020.
Trump and Giuliani also sought Zelensky's assistance to investigate unsubstantiated conspiracies linking Ukraine to the 2016 election.
On July 21, four days before Trump and Zelensky to phone that Trump asked Zelensky to conduct these investigations, Taylor exchanged text messages with Sondland.
Zelensky wants Ukraine to be "taken seriously" rather than simply serving as "a tool in Washington's domestic politics, re-election," says Taylor of Sondland, a key player in efforts to involve Ukraine in election investigations.
And on September 1, the day Vice President Pence met with Zelensky, Taylor again sent a message to Sondland.
"Are we now saying that security assistance and WH meetings are conditioned by investigations? "Taylor asked.
"Call me," Sundland replied, in what the Democrats said was probably an effort to prevent a paper trail.  On September 8, Taylor and Sondland tried to contact Kurt Volker, then US Special Envoy for Ukraine, but Volker could not hear the conversation.
"Gordon and I just talked," writes Taylor Faulker. "I can let you know if Gordon and you don't get in touch." Taylor went on: "The nightmare is that they give interviews and receive no security assistance. The Russians love him. (And I gave up.)
Taylor probably has in mind a potential press release from the Zelensky government that is committed to investigations. He was obviously worried that Zelensky would surrender, but he still would not receive his promised help and that Russia would use that opening to portray the new Ukrainian leader as a patient.
Volker transfers copies of text messages when he volunteers earlier this month.
"The message to Ukrainians (and Russians) that we send with the Security Assistance Decision is key," Taylor wrote the next day. "With the hold, we have already shaken their faith in us. So my nightmare scenario. "
Sundland replied, saying" we have identified the best way forward. " "
" Like I said on the phone, "Taylor replied," I think it's crazy to refuse security assistance for political campaign help. ”
It was five hours before Sundland responded. Later, Sondland testified that he only conveyed what Trump had told him during the intervention call.
"Bill, I believe you are wrong about President Trump's intentions," he writes. "The president was crystal clear and has no quid pro quo. The president is trying to assess whether Ukraine will really accept the transparency and reforms that President Zelensky promised during his campaign. ”
Democrats cited this message, which differs in tone and detail from lazy earlier exchanges, as efforts to cover up.
Taylor is a former Army officer and Vietnam veteran who has served in government positions in Iraq, Afghanistan and elsewhere. He is expected to return to his senior post at the US Institute of Peace sometime next year.
His is the first of two scheduled closed-door deposits this week.
Laura Cooper, Deputy Assistant Secretary of Defense, whose portfolio includes Russia and Ukraine, will testify at a closed session Wednesday, according to an official working on the process.
Several other closed-door deposits will be rescheduled this week due to events in honor of late Congressman Elijah E. Cummings (D-Md
) House investigators were expected to hear from Ambassador Philip Reeker, acting assistant secretary and Eurasian Affairs, and Michael Duffy, associate director of national security programs at the Office of Management and Budget – but these According to the official deposit will no longer take place on Wednesday.
of Americans to handle impeachment request, according to new poll, though Republicans are worse.
Forty-three percent approve of Democrats handling the investigation, while 49 percent disapprove, according to a poll released on Tuesday by CNN conducted by SSRS.
In contrast, 30 percent of Americans approve of Republicans handling the impeachment investigation, while 57 percent disapprove.
In a tweet on Monday, however, acting director of the Office of Management and Budget Russ Wuit said he and Duffy would not comply with the deposit requests, according to reports that state otherwise "fake news". His tweet included the hashtag "#shamprocess".
Trump called on his party on Monday to "step up and fight" its impeachment as House Speaker Nancy Pelosi (D-California) circulated an "information sheet" outlining what the service calls its gross abuse of presidential power, including 'shake', 'pressure campaign' and 'cover-up'.
Karun Demirdian and John Hudson contributed to this report.