US former president Donald Trump has challenged Joe Biden to TV debates, as the rivals hurtle towards a White House rematch following their sweep of the Super Tuesday votes.

The Republican said he would take part in a TV forum with the Democratic president "anytime, anywhere, anyplace" posting online in all capital letters.  

No debates have so far been agreed ahead of November's election.

Donald Trump's challenge came hours after his last Republican rival, Nikki Haley, dropped out of the race to be the Republican nominee for the White House.

"It is important, for the Good of our Country, that Joe Biden and I Debate Issues that are so vital to America, and the American People," Trump posted on his social media website, Truth Social, hours after Haley's departure from the race.

He added that such debates could be run by the Democratic National Committee, or the Commission on Presidential Debates, which has overseen presidential debates for the last 30 years.

Trump said the debate commission - which declares itself non-partisan, but is accused by conservatives of bias - was a "subsidiary" of the Democratic Party.

Donald Trump, 77, has repeatedly claimed Biden, 81, is too old and forgetful to debate him. Biden has in turn suggested it is Trump who is senile.

bd-pratidin/GR