The hearing is the first in the public phase of the impeachment inquiry and features testimony from State Department official George Kent and top USA diplomat in Ukraine Bill Taylor.
In a disclosure that drew the most attention, Taylor, acting ambassador to Ukraine, pointed to Trump's keen interest in getting the eastern European ally to investigate Biden, a former vice president, and reiterated his understanding that $391 million in US security aid was withheld from Kiev unless it cooperated.
He also said he was alarmed by the insistence that a White House meeting between Zelensky and Trump was being conditioned upon Zelensky agreeing to investigations, something he realized before the July 25 phone call between Trump and Zelensky.
He said Giuliani - who Democrats have accused of conducting a shadow foreign policy effort in Ukraine - had conducted a "campaign full of lies" against Marie Yovanovitch, who was abruptly pulled from her post as US ambassador to Ukraine in May.
"Ambassador Sondland responded that President Trump cares more about the investigations of Biden, which Giuliani was pressing for", Taylor testified, referring to Trump's personal lawyer, Rudy Giuliani.
House Speaker Nancy Pelosi said she is 'very prayerful - it's bad - we're actually sad today that our country has come to a place where the President doesn't understand that Article II [of the U.S. Constitution] does not say that he can do whatever he wants, that he is not above the law, and that he will be held accountable'.
"It was counterproductive to all of what we had been trying to do". He testified that Sondland told other senior diplomats that "POTUS wanted nothing less than President Zelensky to go to microphone and say investigations, Biden, and Clinton".
An aide to a senior House Democrat told DailyMail.com on Wednesday that Intelligence Committee chairman Adam Schiff, a California Democrat, planned the jam-packed schedule specifically to swamp the White House and make it hard for any other news to break through to the public.
"There are few actions as consequential as the impeachment of a president", said House Intelligence Committee chairman Adam Schiff, the California congressman overseeing the historic inquiry in the Democratic-controlled House.
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The Intelligence Committee's top Republican, Devin Nunes, has in turn slammed the hearing as a "televised theatrical performance staged by the Democrats", in line with the White House's characterisation of the whole impeachment process as a "hoax". The contentious hearing lasted 5-1/2 hours. "And if President Trump did either, whether such an abuse of his power is compatible with the office of the presidency?"
U.S. Ambassador to the European Union Gordon Sondland will be sworn in Wednesday morning, followed by Deputy Assistant Secretary of Defense Laura Cooper and Under Secretary of State for Political Affairs David Hale in the afternoon.
He said the impeachment inquiry is clearly partisan and added that "this may as well be branded the 'DNC impeachment'".
Schiff added: "If this is not impeachable conduct, what is?"
This week's sessions, where Americans are hearing directly for the first time from people involved in events that sparked the congressional inquiry, may pave the way for the Democratic-led House to approve articles of impeachment - formal charges - against Trump. Republicans control the Senate and have shown little support for Trump's removal.
Trump is the fourth USA president to face impeachment proceedings. "This is a sham and shouldn't be allowed". "Anyone familiar with the Democrats' scorched earth war against President Trump will not be surprised to see all the signs that this is a carefully orchestrated media smear campaign".
Trump asked Zelenskiy to investigate a debunked right-wing conspiracy theory about the 2016 election. They'll also likely ask Kent about the concerns he raised about Hunter Biden's role with the gas company during the Obama presidency that were rebuffed. "They also didn't know that any military aid was being withheld".
The money, approved by the U.S. Congress to help Ukraine combat Russia-backed separatists in the eastern part of the country, was later provided to Ukraine. Members of the committee will then get five minutes each to ask questions, alternating between Republicans and Democrats.
Taylor, a former U.S. Army officer, previously served as U.S. ambassador to Ukraine and is now the chargé d'affaires of the U.S. Embassy in Kiev. They'll likely also highlight that Yovanovitch told lawmakers in her deposition that she supported Trump's decision to offer lethal aid to Ukraine, something Obama resisted, and she supported USA efforts to get Ukraine to fight corruption.
Trump has derided some of the current and former USA officials who have appeared before committees as "Never Trumpers" - a term referring to Republican opponents of the president whom he has called "human scum".