There will be a recount of the US presidential vote in Wisconsin in a blow to Donald Trump's preparation for the presidency.

Failed Green Party candidate Jill Stein has also stepped up her bid to force two other key Midwestern battlegrounds, Michigan and Pennsylvania, to do the same.

In a move that could complicate President-elect Donald Trump's push for national unity as he continues to shape his White House team, Ms Green formally requested a Wisconsin recount on Friday, and vowed to do the same in the coming days in Michigan and Pennsylvania.

Wisconsin officials confirmed on Friday evening they would move forward with the first presidential recount in state history.

Ms Stein gained little more than 1 per cent of the national vote, and there is no evidence of election tampering in the states where Mr Trump scored razor-thin victories.

But Green Party spokesman George Martin insisted "the American public needs to have it investigated to make sure our votes count".

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He said: "We're doing this to ensure the integrity of our system."

Democratic nominee Hillary Clinton leads the national popular vote by close to two million votes.

Mr Trump scored narrow victories in key battleground states, however, giving him the necessary 270 electoral votes to assume the presidency.

He won in Pennsylvania, and in Wisconsin, breaking a Democratic winning streak dating back 32 years. Mr Trump also holds a slim lead in Michigan, where a Republican presidential candidate had not won since 1988; The Associated Press still has not officially called that race.

Wisconsin, where Mr Trump leads by little more than 22,000 votes, will conduct an unprecedented presidential recount, state administrator Michael Haas announced, citing requests by Ms Stein and independent candidate Rocky De La Fuente.

"The commission is preparing to move forward with a statewide recount of votes for president of the United States, as requested by these candidates," Mr Haas said, noting that the recount is expected to be completed by the December 13 federal deadline.

In Michigan, Mr Trump's 10,704-vote lead is expected to be certified by the state elections board on Monday. The deadline to ask for a recount is Wednesday.

A statewide recount would cost Ms Stein roughly $790,000, said Fred Woodhams, a spokesman for the Michigan secretary of state.

An opposing candidate would have seven days to file objections to the recount petition, after which the board would schedule a public hearing and later issue a ruling on the objections.