Michigan Secretary of State Jocelyn Benson said dozens of armed protesters gathered in a threatening manner outside her home on Saturday evening chanting "bogus" claims about electoral fraud.
Michigan officials last month certified the state's election results showing President-elect Joe Biden had won the state in the course of his Nov. 3 election victory. President Donald Trump and his supporters have challenged the outcome in a slew of futile lawsuits, and Biden is to take office on Jan. 20.
Protesters who rallied outside Benson's home held up placards saying "Stop the Steal" and chanted the same message, according here to various clips uploaded on social media.
In a Twitter statement on Sunday, Benson said the protesters were trying to spread false information about the security and accuracy of the US election system. "The demands made outside my home were unambiguous, loud and threatening."
Michigan Attorney General Dana Nessel, in a separate Twitter post, accused the pro-Trump demonstrators of "mob-like behaviour (that) is an affront to basic morality and decency".
"Anyone can air legitimate grievances to Secretary Benson's office through civil and democratic means, but terrorizing children and families in their own homes is not activism."
Benson added: "They targeted me in my role as Michigan's Chief Election Officer. But the threats of those gathered weren't actually aimed at me - or any other elected officials in this state. They were aimed at the voters."
Michigan Governor Gretchen Whitmer, who has clashed publicly with Trump over state coronavirus restrictions, was the target of a kidnapping plot by a far-right militia group during the election campaign, prosecutors said in October.
Michigan, one of a handful of key swing state in the 2020 presidential race, was a target of agitation by Trump and right-wing supporters against stay-at-home orders Whitmer imposed earlier this year to curb coronavirus transmissions.