During her time to ask questions, Rep. Alexandria Ocasio-Cortez, D-N.Y., said the allegations are "extremely serious," but called the hearing an "embarrassment."

She established that none of the four witnesses can give any firsthand witness account of any crimes committed by the president.

"This is an embarrassment. It is an embarrassment to the time and people of this country," she said.

Rep. Glenn Grothman, R-Wis., followed by saying he was concerned about the "seriousness of the allegations."

"We have all sorts of smoke, maybe not fire," he said. "It deserves a strong response from this body."

Rep. Shontel Brown, D-Ohio, asked Democratic witness Michael Gerhardt what he believes is the "primary flaw" in the Republican claims about President Biden.

"Well, I suppose I can say a lot. The problem is the dots are not connected," Gerhardt replied. "The name repeated most often is Hunter Biden, not President Biden. And the point of an impeachment inquiry is not about a president's son, it has to be about the president himself and I don't think those dots connected. Lots of assumptions and accusations, not evidence."

Rep. Jim Jordan, R-Ohio, chairman of the House Judiciary Committee, called testimony from Hunter Biden's former business partner, Devin Archer, "the most telling evidence" of the president's potential involvement in an "influence-peddling scheme."

Jordan said that a Ukrainian prosecutor investigating a Ukrainian company tied to Hunter Biden's was fired after Hunter Biden received a request from Burisma's top executive and then called his father, who "leveraged $1 billion of American tax money" to get the prosecutor fired.

But a review of Archer's testimony, detailed in a publicly-released transcript, shows that Jordan left out key parts of Archer's testimony and mischaracterized other parts of it.

Among other things, Archer said the request from Burisma's top executive wasn't specific to the prosecutor's firing, and he wasn't even sure that Hunter Biden called his father after getting the request.

--ABC News' Mike Levine and Luc Bruggeman

Democrats again tried to force a vote on subpoenaing Trump ally Rudy Giuliani over his alleged efforts to dig up dirt on the Biden family's business dealings in Ukraine and Biden's actions as vice president. Republicans were able to successfully kill the motion.

Chairman Comer attempted to dispense of the motion with voice vote but Democratic Rep. Jamie Raskin pushed for a recorded vote. It failed 20-18.

"Where in the world in Rudy Giuliani?" Rep. Kwesi Mfume, D-Md., bellowed, holding up a piece of paper that read the same.

Several Democrats have said they want to hear from Trump ally Rudy Giuliani.

Rep. Jamie Raskin put forward a motion to subpoena Giuliani and former Giuliani ally Lev Parnas for testimony about what Raskin said were their efforts to dig up dirt on the Biden family's business dealings -- and Biden's actions as then-vice president -- in Ukraine during the Trump administration.

Rep. Jim Jordan, R-Ohio, quickly moved to table Raskin's motion to subpoena both men. Republicans had the votes to kill the motion, though they seemed caught off guard by the request.

Later on, Democratic Rep. Stephen Lynch also said he wanted to hear from Giuliani as he noted none of today's witnesses have first-hand knowledge about what House Republicans have alleged about the Bidens.

"When I walked into this hearing room, my first question was: where's Rudy?" Lynch said.