Reporter and author Jonathan Allen said Tuesday that former President Barack Obama was working against former Vice President Kamala Harris after former President Joe Biden dropped out, advocating for an open primary because he didn't think Harris could win.

"President Obama absolutely did not think that Joe Biden should continue, according to our sources close to President Obama," Allen told MSNBC. "And he also didn’t want Kamala Harris to be the replacement for Biden. He didn’t think that she was the best choice for Democrats, and he worked really behind the scenes for a long time to try to have a mini-primary, or an open convention, or a mini-primary leading to an open convention, did not have faith in her ability to win the election."

Allen, a senior politics reporter at NBC News, and Amie Parnes, a senior political correspondent for The Hill, joined MSNBC to discuss their new book set to be released this month, titled, "FIGHT: Inside the Wildest Battle for the White House."