Departing court after the first day of the trial, Rudy Giuliani told ABC News' Terry Moran that he has no regrets about his treatment of Ruby Freeman and Shaye Moss -- and he doubled down on his core allegations about them.

"When I testify, the whole story will be definitively clear that what I said was true, and that, whatever happened to them -- which is unfortunate about other people overreacting -- everything I said about them is true," Giuliani told reporters.

"Do you regret what you did to Ruby and Shaye?" Moran asked.

"Of course I don't regret it," Giuliani said. "I told the truth. They were engaged in changing votes."

"There's no proof of that," Moran responded.

"You're damn right there is," Giuliani retorted. "Stay tuned."

Court will resume Tuesday at 9 a.m. ET.

Plaintiffs' first witness in the case is a social media monitor who testified about the deluge of "racist and graphic material" targeting Freeman and Moss that appeared online after Giuliani began accusing them by name.

Regina Scott, a retired Chicago Police Department official who now works as a security and risk analyst, testified that negative mentions about Freeman and Moss surfaced online at a prodigious rate.

A report Scott prepared identified more than 710,000 mentions of Freeman and Moss between November 2020 and May 2023, and 320,000 mentions between Aug. 18, 2023, and Nov. 11, 2023.

"The type of violent and racist and graphic material, that's on a level we don't see at all in our work," Scott said.

-ABC News' Laura Romero

Joseph Sibley, an attorney for Rudy Giuliani, implored jurors to withhold judgment of his client and consider a "fair and proportionate" monetary penalty when the trial concludes, framing the $43 million sought by Freeman and Moss as a "truly incredible" figure.

"What the plaintiffs' counsel are asking for in this case is the civil equivalent of a death penalty," Sibley told jurors in brief opening remarks.

Sibley, in making his case to the jury, ceding before arguments even began that Giuliani made defamatory comments about Freeman and Moss -- but he refuted the notion that his comments led to the abuse that followed.

"There's really no question that these plaintiffs were harmed," Sibley said. "They're good people, they didn't deserve what happened to them."

But Sibley urged jurors to consider only "what can actually be attributed to Mr. Giuliani."

"He never promoted violence against these women, never made racist statements about them," Sibley said of Giuliani. "That was other random people."

Ruby Freeman and Shaye Moss suffered a "perpetual nightmare," their attorney Michael Gottlieb told the jury during his opening remarks, saying that the damage they suffered warrants an "award in the tens of millions of dollars."

Gottlieb told jurors his clients suffered three types of damages -- reputation, emotional and punitive -- due to Giuliani's "defamation campaign."

In addition to the costs to "repair their reputation," Gottlieb told jurors that Freeman and Moss' award should account for lost wages, forced relocation, security expenses, and more.

-ABC News' Laura Romero

Shaye Moss felt dejected and fearful after Rudy Giuliani's defamatory statements and accusations about her proliferated online -- prompting the veteran election worker to change her appearance and leave her job.

John Langford, an attorney for Moss, displayed emails and messages she received on social media in late 2020, as her name circulated online in right-wing media. One read, "Be glad it's 2020 and not 1920."

The chilling message, which she said made her "afraid for my life," prompted her to assume a new physical identity.

"I went into my hair salon and I asked my stylist to make it so the same person she saw walk in here is not the person who leaves," Moss recalled.

Her stylist, she said, "dyed it a strawberry blond color." A selfie Moss took the following day showed her with a "puffy face from crying all night."

Though her hair changed, Moss said she returned to work after "the worst Christmas" of her life, determined to return to normalcy. "My goal was still to make sure that everything was ready for our next election, that everything ran smoothly," she testified.

Instead, she recalled, "Things ain't never returned to normal."

Moss left the Fulton County elections office in April 2022 after she was passed over for a promotion. "It felt like a slap in the face," she said, because she sensed that her superiors thought it would look bad for the county.

"I wanted to retire a county worker, like my grandma -- make her proud, make my mom proud -- but..." she said, trailing off in tears.

Rudy Giuliani, seated at the defense table, showed little emotion as Moss wept on the witness stand. Leaning with his elbow on the table, the former mayor took intermittent notes as she testified.

-ABC News' Lucien Bruggeman and Laura Romero