Once the Democratic impeachment managers have finished the last day of opening arguments, the president's legal team is set to begin three days of laying out its case on Saturday.
Testimony and House Intelligence evidence highlight Giuliani's attempts to coordinate with USA and Ukrainian officials, which House Democrats argue took place on Trump's behalf.
So, is this a real trial?
"Impeachment is reserved for deliberate decisions by the president to embark on a course of conduct that betrays his oath of office and does violence to the Constitution", Nadler said.
Alabama Democratic U.S. Senator Doug Jones is among the senators hearing the arguments.
Lead House manager and California Rep. Adam Schiff turned to comments made by several witnesses who testified before the House Intelligence Committee as part of the impeachment inquiry late previous year. "If you're the vice president of the United States and the Ukraine is in your portfolio, you're going to have to answer questions about how your son made three million dollars from the most corrupt company in the Ukraine, you didn't know about it", Graham said. Arguments addressing this will be heard on Friday.
The key impeachment article charges Trump with abusing his office to benefit his 2020 campaign by secretly withholding nearly $400 million in military aid to Ukraine and a Washington DC meeting with its president, Volodymyr Zelenskiy, unless Kyiv publicly announced an inquiry into the former vice-president Joe Biden, and his son Hunter's past ties to a Ukrainian energy firm.
After the House prosecutors finish, the president's lawyers will have as long as 24 hours. Actually, it is unclear who Trump is mad at, nor does it really matter.
Air Canada follows WestJet as it removes Boeing 737 Max until June
WestJet, which has 13 Boeing 737 Max jets, said it would be updating its schedule to remove the aircraft from use until June 24. Until recently, Boeing had often suggested the fixes were nearly ready to be submitted to regulators and approval was imminent.
"Today the House Democrats - perhaps unintentionally - they threw Joe Biden under the bus", said Ted Cruz, Republican senator from Texas.
This was another example during Democrats' impeachment arguments of using clips from Trump allies and officials to make their argument after House Judiciary Chair Jerrold Nadler (D-N.Y.) made strategic use of 1990s-era quotes from Sen.
The president's defenders' turn will come Saturday.
Instead, Trump administration lawyers insist the fight is fundamentally one between Congress and the Executive Branch. If the door is opened to new witnesses sought by Democrats, 51 Republicans could join together to call their own slate, and several GOP senators have said one or both Bidens should be on that list.
Senators were permitted Thursday to review supplemental testimony submitted by Jennifer Williams - an aide to Vice- President Mike Pence - who was among those who had concerns about Trump's actions.
Needing a two-thirds majority to convict the president, Democrats would have to secure support from 20 Republicans to remove Trump, a prospect widely viewed as impossible. A lawyer for Williams declined to comment. Graham said. "That's becoming relevant because they talked about it nearly 50 times that the president had no reason to believe that anything improper occurred in the Ukraine with the Bidens. And that is a real serious issue", he said. Among those who Democrats want to call are acting White House Chief of Staff Mick Mulvaney and former Trump National Security Adviser John Bolton.
Without witnesses, the impeachment trial could go to a vote and conclude as early as next week.
"We're seeking the truth at a momentous time in the American republic", Schumer said.
The impeachment trial is taking presidential candidates like Bernie Sanders (centre) from the campaign trail.