US President Donald Trump has spoken out about revelations tying Hillary Clinton's presidential campaign to a dossier of allegations about his ties to Russia.

Hillary Clinton's presidential campaign and the Democratic National Committee helped pay for political research into Donald Trump that ultimately produced a dossier of allegations about his ties to Russia, sources say.

Hillary Clinton's presidential campaign and the Democratic National Committee helped fund political research into President Donald Trump that ultimately produced a dossier of allegations about his ties to Russia, a source has said.

Donald Trump has claimed without evidence that "millions" voted illegally in the presidential election and said it was rigged even as he prepares to enter the White House.

The US is braced for more polling day mayhem this week as technical glitches threaten to turn the crucial mid-term vote into a repeat of the 2000 presidential election fiasco.