US President Donald Trump said he has pardoned former Colorado elections clerk Tina Peters, who is serving a nine-year sentence for allowing unauthorised access to voting machines during the 2020 presidential election.
Peters was convicted last year on seven state charges, including three counts of attempting to influence a public servant and one count of conspiracy to commit criminal impersonation.
Presidential powers to pardon are widely understood to apply only to federal crimes - not those at a state level.
In a statement, Colorado Attorney General Phil Weiser said Trump's pardon has no legal precedent and "will not hold up".
Trump has frequently claimed, without evidence, that he lost the 2020 election to Joe Biden due to voter fraud.
