Washington, Nov 2: Republican presidential nominee Donald Trump has urged American citizens who have in early voting already cast their ballots for his Democrat rival Hillary Clinton to change their votes.

\"This is a message for any Democratic voters who have already cast their ballots for Hillary Clinton and are having a bad case of buyer\'s remorse -- in other words you want to change your vote -- Wisconsin is one of several states where you can change your early ballot if you think you\'ve made a mistake,\" Trump said on Tuesday.

In a rally in Eau Calire in Wisconsin, Trump said a lot of things had come to light since early voting began, such as the Federal Bureau of Investigation\'s (FBI) reopening of the investigation against Clinton for using her private email server while she was Secretary of State (2009-2013), Efe news reported.

The real-estate tycoon said the option to change early vote was allowed only in some states like Minnesota, Wisconsin, Pennsylvania and Michigan, all of them presumably Democratic states.

For example, in Pennsylvania, voters who wish to switch their vote have to show up at the polling station on the election day on November 8 and tell the staff that they would like to vote again.

The latest polls place Trump and Clinton neck to neck in the contest, following the reopening of the FBI investigation.

Early voting in some US states is going ahead full steam, for example, in Florida, where 33 percent of the registered voters -- over four million -- have already cast their vote.

Trump urges Clinton\'s early voters to change their choice