Jill Biden's anger at Kamala Harris detailed in new book.

First lady Jill Biden expressed frustration that Kamala Harris was the top choice for vice president, according to an upcoming book.

Jill Biden reportedly argued against Joe Biden picking Kamala Harris as his running mate in the 2020 election because she “attacked” him during the first Democratic primary debate.

News from Jonathan Martin and Alexander Burns' forthcoming book, "This Will Not Pass: Trump, Biden, and the Battle for America's Future,"

Jill Biden had after she learned Kamala Harris became a leading candidate to serve as Biden's running mate.

'There are millions of people in the United States,' she began. Why? Jill Biden asked.

According to the book, told Biden early on that Kamala Harris was most qualified for the job as she had sought the presidency herself.

 "Choosing Kamal Harris will show people that you are magnanimous and forgiving, Klein told Biden. It will show the country just what a unifying leader you can be."

 Biden's advisers considered Kamala Harris to be the safest choice for winning the White House, even with her history of targeting Biden.

 "You know, white women are incredibly racist, as are white men," a close adviser to Biden said in the book. "None of it was safe. It was a risky thing to do. But it was the safest of choices that we had."

This Will Not Pass: Trump, Biden, and the Battle for America's Future.