Sen. Bernie Sanders Bernie SandersKenosha will be a good bellwether in 2020 Biden's fiscal program: What is the likely market impact? McConnell accuses Democrats of sowing division by 'downplaying progress' on election security MORE (I-Vt.) on Thursday hit back at Hillary Clinton Hillary Diane Rodham ClintonWhat Senate Republicans have said about election-year Supreme Court vacancies Bipartisan praise pours in after Ginsburg's death Trump carries on with rally, unaware of Ginsburg's death MORE's comments about him in her upcoming book about the 2016 presidential election, asking if anyone actually believed them.

"I.e., Bernie Sanders just stole all of Hillary Clinton's ideas. Does anybody really believe that?" Sanders said on MSNBC's "All In" after host Chris Hayes read excerpts from Clinton's forthcoming book, "What Happened."

"The truth is, and really story is, that the ideas that we brought forth during that campaign, which was so crazy and so radical, have increasingly become mainstream," Sanders continued, citing proposals such as a $15 minimum wage, $1 trillion infrastructure program, tuition-free college and "Medicare for all."

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Sanders was responding to an excerpt of the book where Clinton writes that her policy adviser, Jake Sullivan, compared Sanders's policy ideas to a scene from "Something About Mary," where a hitchhiker rolls out a plan to make seven-minute abs to top eight-minute abs.

"That's what it was like in policy debates with Bernie. We would promise a bold infrastructure investment plan or an ambitious new apprenticeship program for young people, and then Bernie would announce basically the same thing, but bigger. On issue after issue, it was like he kept promising four-minute abs, or even no-minutes abs. Magic abs!" Clinton wrote.

Sanders is not the only figure Clinton takes aim at in her new book about the 2016 presidential campaign.

Clinton questions the actions of former President Barack Obama Barack Hussein ObamaObama calls on Senate not to fill Ginsburg's vacancy until after election Senate Republicans face tough decision on replacing Ginsburg Cruz: Trump should nominate a Supreme Court justice next week MORE for "keeping her in a straight jacket" in an effort to stop her from attacking Sanders, as well as former Vice President Joe Biden Joe BidenSenate Republicans face tough decision on replacing Ginsburg What Senate Republicans have said about election-year Supreme Court vacancies Biden says Ginsburg successor should be picked by candidate who wins on Nov. 3 MORE for his assessment that Democrats did not focus on the middle class during the presidential race.