Giuliani, a former federal prosecutor and New York City mayor, was ordered to pay a $US150,000 ($A233,950) bond and not to intimidate any of his 18 co-defendents or witnesses in the case, according to court papers.

“This indictment is a travesty,” Giuliani told reporters after his jail appearance.

“This is an assault on the constitution.”

Seven other of Trump’s co-defendants in the criminal case brought by Fulton County District Attorney Fani Willis accusing him and his associates of trying to reverse his 2020 election loss in Georgia already have surrendered at an Atlanta jail, according to county records.

Trump, the front-runner for the 2024 Republican nomination to challenge Democratic President Joe Biden, continues to claim that his defeat was the result of fraud.

Federal and state election officials and Trump’s attorney general have said there is no credible evidence the 2020 election was tainted.

Speaking in New York before flying to Atlanta on Wednesday, Giuliani denied wrongdoing and defended Trump.

“I’m feeling very, very good about it because I feel like I’m defending the rights of all Americans,” Giuliani told reporters.

“I’m telling the truth, they’re lying.”

Trump was set to turn himself in on Thursday to face his fourth criminal indictment this year.

The remaining 10 co-defendants named in the Georgia indictment have until Friday to surrender.

Trump has called his four indictments politically motivated.

In Georgia, Giuliani was accused of making numerous false statements about election fraud, including to officials in other states such as Arizona and Pennsylvania, in a failed bid to convince them to approve an alternative slate of electors in the formal congressional certification of the election results to keep Trump in power.

Giuliani and other Trump allies were also accused of making false statements to Georgia lawmakers about the election.

Lawyer Sidney Powell, who played a leading role in promoting Trump’s fraud claims, was booked at the jail on Wednesday, according to records posted on the country sheriff’s website.

Trump campaign lawyer Kenneth Chesebro, indicted for allegedly helping to devise a plan to submit fake slates of electors for Trump to obstruct the congressional certification, turned himself in at the Fulton County sheriff’s office on Wednesday, jail records showed.

Ray Smith, a lawyer who previously represented Trump in Georgia, also surrendered on Wednesday.

On Tuesday, Trump’s former lawyer John Eastman and Republican poll watcher Scott Hall surrendered while former Georgia Republican Party leaders Cathy Latham and David Shafer – were booked overnight, according to the jail.

Shafer, Trump’s former White House chief of staff Mark Meadows and former Justice Department official Jeffrey Clark have filed petitions to have their cases moved to federal court.

-AAP