US President Donald Trump has told people in the state of North Carolina to vote twice in November's election, despite this being illegal.
Mr Trump suggested voters send a postal vote and then vote in person in order to test the system.
The president has frequently made false claims that postal votes are vulnerable to significant electoral fraud.
"Let them send it in and let them go vote," he told North Carolina broadcaster WECT-TV on Wednesday.
"And if the system is as good as they say it is then obviously they won't be able to vote (in person)."
On Thursday, he tweeted that if people vote by post they should also go to the polling station "to see whether or not your mail-in vote has been tabulated" and vote in person if necessary.
After President Trump made the initial comments, North Carolina Attorney General Josh Stein tweeted that he had "outrageously encouraged" people in the state to "break the law in order to help him sow chaos in our election".
Mr Trump suggested voters send a postal vote and then vote in person in order to test the system.
The president has frequently made false claims that postal votes are vulnerable to significant electoral fraud.
"Let them send it in and let them go vote," he told North Carolina broadcaster WECT-TV on Wednesday.
"And if the system is as good as they say it is then obviously they won't be able to vote (in person)."
On Thursday, he tweeted that if people vote by post they should also go to the polling station "to see whether or not your mail-in vote has been tabulated" and vote in person if necessary.
After President Trump made the initial comments, North Carolina Attorney General Josh Stein tweeted that he had "outrageously encouraged" people in the state to "break the law in order to help him sow chaos in our election".