Donna Brazile also accused the House Minority Leader of being "terrified of telling the truth" about the January 6 attack.
"Fox & Friends" spent much of its Tuesday show blasting Bernie Sanders for being a "millionaire, 1 percenter, socialist."
The Vermont lawmaker said Donna Brazile showed "courage" by disclosing what she learned about Hillary Clinton's campaign and the DNC.
"As has now come out, that just wasn't the case," she said.
The political analyst's book flew off Amazon's virtual shelves and was sold out.
The former interim chairwoman of the Democratic National Committee wrote about the unsolved murder of Seth Rich in her new book.
The results showed opinions about the Democratic Party are at a 25-year low.
Rich's mysterious death was the subject of conspiracy theories.
Brazile passed information to the Clinton campaign before a debate in Flint, Michigan.