In one of two Georgia U.S. Senate runoff elections -- with control of the chamber at stake -- Republican incumbent Sen. Kelly Loeffler and Democratic challenger Raphael Warnock are elevating attacks on one another ahead of their Jan. 5 showdown at the polls.

Loeffler’s campaign slammed Warnock earlier this week with an attack that ad accuses him of sympathizing with Marxists and socialists. She has also tried to brand him as “the most radical and dangerous candidate in America.”

ALLEGATIONS IN GEORGIA DEMOCRAT'S HANDLING OF CHILD ABUSE CASE RESURFACE

Warnock denied those claims in an interview with MSNBC on Thursday. Then, the Washington Free Beacon shared a resurfaced video of him delivering a 2009 sermon in which he said he was “sick and tired” of critics who attacked socialism rather than engaging in substantive debates.

"This is another absurd attack from Kelly Loeffler, who has nothing good to say about herself and who stands with White supremacists and QAnon conspiracy theorists,” Warnock’s campaign told Fox News on Friday.

That line of attack likely refers to Loeffler’s endorsement last month from Marjorie Taylor Greene, a controversial Republican who won her own House race.

Greene told Fox News in August that she no longer supports QAnon, a far-right conspiracy theory centered on the claim that President Trump is secretly fighting enemies in the “deep state” and a child sex trafficking ring run by satanic pedophiles and cannibals.

Warnock’s campaign said the 2009 speech was about health care amid the H1N1 pandemic that was happening at the time. In it, Warnock knocked attacks on socialism.

GEORGIA SENATE CANDIDATE WARNOCK WAS YOUTH PASTOR OF CHURCH THAT HOSTED, PRAISED FIDEL CASTRO IN 1995

"We don't ask people to buy their own police protection, their own fire protection,” he said. “We decided long ago that we ought to pool our resources and pick up everybody's garbage so that free enterprise can take place.”

He singled out attacks on “socialistic medicine” and said when a vaccine comes out, both the rich and poor would line up to get it.

“This sermon focused on the need for health care coverage, which Reverend Warnock said then is a human right, and something Kelly Loeffler has attacked throughout her short time in the Senate, where she's looked out only for herself," a Warnock spokesperson said.

GEORGIA SENATE RUNOFF SHOWDOWNS DRAW POTENTIAL 2024 GOP PRESIDENTIAL CONTENDERS

On Wednesday, Loeffler’s campaign demanded answers from Warnock over past charges that he interfered with an investigation into a child abuse case at a Baltimore church summer camp in 2002 -- even though prosecutors later said those charges stemmed from “some miscommunication” and were dropped.

Another decades-old detail also reemerged surrounding Warnock earlier this week: Before working at the Baltimore church, he worked at one in New York City that hosted and celebrated the late Cuban dictator Fidel Castro.

CLICK HERE TO GET THE FOX NEWS APP

His campaign said he was a junior staff member at the time and played no role in the visit from Castro during his 1995 trip to New York City to address the United Nations.

The Associated Press contributed to this report.