“I can’t begin to describe the abnormality and disturbing behaviour that would cause a presidential candidate, a former president, to threaten public servants with mass arrest,” said Becker, who previously worked as a lawyer for the Justice Department for seven years.

Several election officials also called threats of violence “unacceptable”.

“Donald Trump will not accept the results of the election unless he wins,” said Colorado Secretary of State Jena Griswold. “This is another step in his campaign to undermine confidence in our elections, which has led to unprecedented threats of violence against election officials.”

A spokesperson for the Trump campaign did not immediately reply to a request for comment on Trump’s post.

Late last month, during a conversation with the conservative Moms for Liberty group, Trump conceded that he lost the 2020 election “by a whisker”, marking one of his most clear public acceptances that he lost the election to Joe Biden. Days later, he once again publicly acknowledged that he did not win the 2020 presidential election, telling podcaster Lex Fridman that he “lost by a whisker”.

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In the wake of the 2020 election, Trump and his allies pushed to overturn the election results through phone calls, speeches, tweets and media appearances in six swing states where certified results declared Biden the winner.

Trump most recently began escalating his rhetoric about election fraud when Harris replaced Biden at the top of the ticket and pulled ahead in some polls. In remarks before the Fraternal Order of Police last week, the former president urged officers to patrol polling places because it would intimidate would-be cheaters.

“I hope you watch for voter fraud,” he said. “Watch for the voter fraud because we win without voter fraud. You can keep it down just by watching because, believe it or not, they’re afraid of that badge. They’re afraid of you people.”

But while Trump’s post falsely claimed that there was “rampant Cheating” in the 2020 presidential race, his efforts to overturn his loss in the last election faltered in multiple courts when his lawyers and allies could not produce evidence of widespread voter irregularities. In nearly four years since, Trump and his allies have failed to substantiate his claims that he lost the 2020 race due to fraud.

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In one of those cases, US District Judge Steven Grimberg, whom Trump named to the bench in 2019 in the Northern District of Georgia, wrote that the president’s attempt to block certification of Biden’s win in the state “would breed confusion and potentially disenfranchisement that I find has no basis in fact or in law”.

Election officials who are credibly found to have engaged in criminal activities are already prosecuted in the country. Last month, for example, Tina Peters, a former county clerk in Colorado and a Trump ally, was found guilty of seven charges connected to allowing a purported computer expert to copy election data from her office as Trump and his allies searched for evidence to prove their baseless claims of election fraud. Another county election official, Misty Hampton of Coffee County, Georgia, faces felony charges along with 14 others, including Trump, for their role in trying to overturn the 2020 result.

And, in the years after Trump began baselessly alleging fraud in the 2020 election, some states such as Iowa, Georgia and Arizona have passed laws beefing up penalties for some election-related offences despite a lack of evidence that elections in their states were run unfairly. In some cases, these new state election laws effectively criminalise election workers’ errors, raising concerns about the possibility of unfair prosecutions like the kind Trump appeared to describe in his post.

Threats and harassment of election workers have skyrocketed since Trump and his allies began denying the results of the 2020 election, amplifying their false claims on television, podcasts and social media. The developments caused a mass exodus of veteran election administrators from their jobs, and prompted scores of election offices around the country to harden their physical workspaces with bulletproof glass, emergency buttons and extensive crisis training.

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Michigan Secretary of State Jocelyn Benson, who was directly targeted by armed pro-Trump protesters who gathered outside her home after the 2020 election, on Sunday told The Washington Post that no threats from Trump would dissuade her from performing her duties this election year.

Benson said that her job, and the job of every election official in the country, is to “rise above this noise and focus on continuing to ensure our elections are fair, secure, accessible, and that the results continue to be an accurate reflection of the will of the people”.

Seth Bluestein, a Republican Philadelphia city commissioner, said every election official he knows “is focused on doing their job well, which unfortunately now also includes preparing for potential threats and violence”.

And Jeff Greenburg, a former director of elections in Mercer County, Philadelphia, on Sunday said the “continued demonisation of election officials is disappointing, disheartening, irresponsible and infuriating”.

“Words matter and this does nothing but potentially put those dedicated public servants in harm’s way. It has to stop,” he said.

On Sunday, North Dakota Governor Doug Burgum, a Trump campaign surrogate, minimised Trump’s comments in an interview with NBC News’s Meet the Press, saying the former president was “just putting people on notice” that the country must have “free and fair elections”.

But a Republican official in a battleground state who spoke on the condition of anonymity to speak candidly about Trump’s comments found the former president’s post more alarming.

“He sounds like he is losing it,” the Republican official said. “Sad. Someone should do something, like replace him as a candidate.”