Among those indicted were some of Trump's closet advisers, including his former chief of staff Mark Meadows and Trump's one-time personal attorney Rudy Giuliani.

"Trump and the other Defendants charged in this Indictment refused to accept that Trump lost, and they knowingly and willfully joined a conspiracy to unlawfully change the outcome of the election in favor of Trump," the indictment's introduction says.

"That conspiracy contained a common plan and purpose to commit two or more acts of racketeering activity in Fulton County, Georgia, elsewhere in the State of Georgia, and in other states," it says.

Former President Donald Trump and 18 others have been indicted by a Fulton County grand jury in connection with efforts to overturn the 2020 election results in Georgia, according to court documents.

A Fulton County grand jury has handed up an indictment related to efforts to overturn the results of the 2020 presidential election in Georgia, according to multiple sources.

A spokesperson for Fulton County District Attorney Fani Willis declined to comment.

Georgia Gov. Brian Kemp, who Donald Trump allegedly pressured to overturn the 2020 election results in the state, is defending the state's election process in response to the Fulton County indictment and Trump’s Truth Social post announcing a press conference on alleged voter fraud in Georgia.

"The 2020 election in Georgia was not stolen," Kemp said in a statement. "For nearly three years now, anyone with evidence of fraud has failed to come forward -- under oath -- and prove anything in a court of law. Our elections in Georgia are secure, accessible, and fair and will continue to be as long as I am governor."

He added, "The future of our country is at stake in 2024 and that must be our focus."

-ABC News' Lalee Ibssa