Hillary ClintonHillary Diane Rodham ClintonState Dept: Russia’s allegations about American citizens ‘absolutely absurd’ Trump on possible sit-down with Mueller: 'I've always wanted to do an interview' Election Countdown: Senate, House Dems build cash advantage | 2020 Dems slam Trump over Putin presser | Trump has M in war chest | Republican blasts parents for donating to rival | Ocasio-Cortez, Sanders to campaign in Kansas MORE criticized former Vice President Joe BidenJoseph (Joe) Robinette BidenElection Countdown: Senate, House Dems build cash advantage | 2020 Dems slam Trump over Putin presser | Trump has M in war chest | Republican blasts parents for donating to rival | Ocasio-Cortez, Sanders to campaign in Kansas Hoping to catch fire, House Dems eye White House Dems look for candidate who will punch Trump ‘square in the face’ MORE in her new book for his assessment that Democrats did not focus on the middle class during the presidential race. 

The Democratic nominee defeated by President Trump writes that she found Biden's comments "remarkable" given his own campaigning for her, in which he talked about what she would do for the middle class.

"Joe Biden said the Democratic Party in 2016 'did not talk about what it always stood for — and that was how to maintain a burgeoning middle class,' " Clinton said in her new book, "What Happened," which was obtained by CNN.

"I find this fairly remarkable, considering that Joe himself campaigned for me all over the Midwest and talked plenty about the middle class," she continued. 

Clinton was referring to comments made in May by Biden, in which he criticized Democrats' strategy to win over working-class voters.

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"Because of the negative campaign that [Donald] Trump ran, how much did we hear about that guy making 50,000 bucks on an assembly line, the woman — his wife — making $28,000 as a hostess?" Biden said in May. 

"They have $78,000, two kids, living in a metropolitan area, and they can hardly make it," Biden continued, adding "When was the last time you heard us talk about those people?" 

Biden is not the only figure in Clinton's book to take heat over her shocking loss.  

Clinton offers frank assessments of former FBI Director James Comey and Russian President Vladimir Putin for their actions during the campaign. 

The former nominee even points at former President Barack ObamaBarack Hussein ObamaEx-White House stenographer: Trump is ‘lying to the American people’ Trump has the right foreign policy strategy — he just needs to stop talking The Hill's 12:30 Report — Trump faces bipartisan criticism over Putin presser, blames media for coverage MORE, saying he could have put out a stronger response to Russia's efforts to influence the outcome of the election.

And she is critical of Sen. Bernie SandersBernard (Bernie) SandersElection Countdown: Senate, House Dems build cash advantage | 2020 Dems slam Trump over Putin presser | Trump has M in war chest | Republican blasts parents for donating to rival | Ocasio-Cortez, Sanders to campaign in Kansas House Dems launching Medicare for All Caucus Let's remove the legal shield from hackers who rob us of our civil rights MORE (I-Vt.), who she defeated in a tough Democratic primary.

The book is set to be released on Sept. 12.