WASHINGTON: President Donald Trump's campaign said Wednesday it was demanding a recount in Wisconsin, where early returns show Democrat Joe Biden with a slender lead.

"There have been reports of irregularities in several Wisconsin counties which raise serious doubts about the validity of the results," campaign manager Bill Stepien said in a statement.

"The president is well within the threshold to request a recount and we will immediately do so."

Wisconsin is one of a handful of states where the fate of the US election now hangs in the balance.