The Arizona grand jury which indicted 18 Republican supporters of Donald Trump who falsely claimed he won the state in the 2020 election wanted to consider also charging the former president, but prosecutors urged them not to, according to court documents.

The court records filed by Democratic attorney general Kris Mayes’ office contain exchanges between prosecutors and the grand jurors, who heard 18 days of testimony.

As grand jurors were considering possible charges, a prosecutor asked them not to indict Mr Trump, citing a US Justice Department policy that limits the prosecution of someone for the same crime twice.

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Republican presidential candidate former President Donald Trump arrives to speak at a campaign rally (AP Photo/Alex Brandon)

The prosecutor, who is not identified in the records, did not know whether authorities had all the evidence they would need to charge Mr Trump at that time.

“I know that may be disappointing to some of you,” the prosecutor said. “I understand.”

Ultimately, the grand jury indicted 18 people on forgery, fraud and conspiracy charges, including 11 Republicans who submitted a document falsely claiming Mr Trump had won Arizona, five lawyers connected to the former president and two former Trump administration aides.

Although Mr Trump was not charged in the Arizona case, the indictment refers to him as an “unindicted coconspirator”.

The former president is charged in a federal case brought by special counsel Jack Smith with plotting to overturn the 2020 presidential election.

Jason Lamm, a former prosecutor who now works as a criminal defence attorney in Phoenix, said Ms Mayes’ office is not bound by US Justice Department policy.

“That was a choice, rather than an obligation,” said Mr Lamm of prosecutors asking grand jurors not to indict the former president.

Mr Lamm, who does not represent anyone charged in the case, said even if Mr Trump had been indicted and Ms Mayes’ office did not want to prosecute him, “there would have been alternative means to dispose of the case rather than potentially infringe on the autonomy of the grand jury.”

The filing by Arizona prosecutors also revealed they had asked grand jurors not to bring charges against a group of Republican state lawmakers for signing a document that urged then-vice president Mike Pence to accept the Arizona fake electors’ forged electoral college certificates.

When grand jurors inquired about charging the 22 sitting Republicans and eight others who had won election but had not yet taken office, the prosecutor expressed caution when talking about proving an intent to defraud by all legislators who signed the document.

Earlier this week, attorney Jenna Ellis signed an agreement with Arizona prosecutors who will dismiss charges against her in exchange for her cooperation. She pleaded guilty in Georgia last year to a felony charge over efforts to overturn Mr Trump’s 2020 election loss in that state.

Republican activist Loraine Pellegrino, who signed the document falsely claiming Mr Trump had won Arizona, became the first person to be convicted in the state’s fake elector case.

Prosecutors say she pleaded guilty to a misdemeanour charge of filing a false document.

The remaining defendants, including former New York City mayor Rudy Giuliani and Mr Trump’s presidential chief of staff Mark Meadows, have pleaded not guilty.

Eleven people nominated to be Arizona’s Republican electors met on December 14 2020 to sign a certificate saying they were “duly elected and qualified” electors and claimed Mr Trump had carried the state in the 2020 election. President Joe Biden won Arizona by 10,457 votes.

A one-minute video of the signing ceremony was posted on social media by the Arizona Republican Party at the time. The document was later sent to Congress and the National Archives, where it was ignored.

Prosecutors in Michigan, Nevada, Georgia and Wisconsin have also filed criminal charges related to the fake electors scheme. Arizona authorities unveiled the felony charges in late April.