"At least, that's been reported to us".
Giuliani's name comes up multiple times in the July 25 conversation between the president and Zelenskiy, and he has publicly acknowledged trying to gather damaging information on Democrats from Ukrainian officials, specifically targeting former Vice President Joe Biden, a leading Democratic presidential candidate for the 2020 race against Trump.
Asked then "what do you know" about a report of the conversation between Trump and the president of Ukraine, Pompeo said he hadn't seen either the report or the whistleblower complaint and went on to talk about how the United States has provided military support to the government of Ukraine in its fight with Russia-backed separatists.
Trump, who is seeking a second four-year term as president, has denied wrongdoing and has assailed the impeachment probe.
In halting any appearances by State officials, and demanding that executive branch lawyers accompany them, Pompeo is underscoring Attorney General William Barr's expansive view of White House authority and setting a tone for conflicts to come.
"We should always work to respect whistleblowers' requests for confidentiality", Mr. Grassley said in a statement. "It is about helping Ukrainians get graft out, and corruption out of their government, and to help this new government in Ukraine build a successful, thriving economy".
Pompeo also accused Democrats of sticking to what he described as "bully"-like tactics pertaining to the impeachment inquiry".
President Trump's reelection campaign released a new advertisement on Wednesday accusing Democrats of carrying out a "coup", shortly after the president himself made a similar accusation amid the Democrats' impeachment inquiry.
They wrote that if it is true Pompeo participated in the call, then he is "now a fact witness in the impeachment inquiry".
Asked about his concerns, Mr Pompeo said State Department employees had been contacted directly by lawmakers or their staff and told not to talk to the State Department's legal counsel.
The funds have since been unlocked and Congress and the State Department have given initial approval to sell Kyiv $39 million worth of anti-tank missiles to help it battle Russian-backed separatists in the eastern part of Ukraine. And we won't tolerate folks on Capitol Hill bullying, intimidating State Department employees. "That's unacceptable, and it's not something that I'm going to permit to happen".
Three Democratic House chairmen warned Pompeo of possible criminal charges Tuesday after he rejected a plan by their committees to take testimony from five State Department officials starting Wednesday.
It went on to lumber the Democrats for launching the impeachment inquiry with an abet from their "media lapdogs".
On Twitter on Tuesday, Trump repeated his assertion that his call with Zelensky was "perfect", and attacked House Speaker Nancy Pelosi and California Rep. Adam Schiff, the House intelligence committee chairman. "Here's correct one other Fake News Media, at the side of their associate, the Democrat Web together, HOAX!"
Late last week, Pompeo was subpoenaed by the chairmen of the House Intelligence, Foreign Affairs and Oversight committees over his failure to produce documents related to Ukraine.
Meanwhile, two former officials who were engaged in the Trump administration's dealings with Ukraine will meet with US congressional committees starting this week.
The invitation said only that the inspector general, Steve Linick, "would like to discuss and provide staff with copies of documents related to the State Department and Ukraine".
Staff members from the Senate and House of Representatives oversight committees were invited to the briefing. Former U.S. envoy to Ukraine Kurt Volker is expected to speak to the committees on Thursday.
Hours later, Schiff said that if the Trump administration attempts to "stonewall" the impeachment process, such actions "will be considered further evidence of obstruction of justice, and of course, that was an article of impeachment against Nixon - the obstruction of the lawful functions of Congress, that is".
While the result showed that appetite for impeachment among the public is increasing, opinion on whether Trump should be removed from office as a result of the impeachment remain divided.