Days after Republican candidate Donald Trump won the US presidential election, former House speaker Nancy Pelosi blamed Joe Biden for not leaving the race sooner.

Pelosi suggested that there could have been an open primary to determine Biden's replacement if he'd stepped aside earlier, and she claimed Biden's decision to endorse Kamala Harris four months from the election foreclosed that possibility.

US correspondent Dan Mitchinson says the Democrats have been pointing fingers to determine what went wrong last week - but he's got a theory as to what went wrong.

"I think the Democrats underestimated a majority of the country. I think they were focused on what we call the left and the right coasts out here - California and New York - and they forgot the heartland of America, the Midwest and parts of the south." 

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