Since losing last year's US election to Donald Trump, Kamala Harris has kept a pretty low profile.

But her upcoming campaign memoir, 107 Days — which the ABC has received a copy of — reveals the former vice-president still has plenty to say.

Here are some of the takeaways.

Harris voices frustrations with the Bidens, his team — and herself

Harris uses her book to criticise those people around former president Joe Biden — including herself — who didn't challenge his decision to run for re-election.

"In retrospect, I think it was recklessness," she writes. "This wasn't a choice that should have been left to an individual's ego, an individual's ambition."

While she doesn't accept Biden was no longer mentally fit for the presidency, she was worried about his ability to campaign, given

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