He will speak about how the progressive movement can move forward and achieve its priorities.
"I'm honored to join the women at the front lines of our struggle for economic, social, racial and environmental justice," Sen. Sanders said. "In January, millions of women came out in an extraordinary and unprecedented display of power and resistance.
"Now more than ever, we must support the leadership of women across the country and fight together to advance our progressive agenda."
Tamika Mallory, Women's March co-president, said Sen. Sanders has been a "fierce champion" of women's rights.
"We are honored that he will be joining us at the convention to lend his voice in support of women leaders from across the country who will be converging in Detroit," Mallory said. "We look forward to hearing from him on how he plans progressive policies that will empower and protect the most marginalized among us."
However, some people weren't happy with the organizers' decision to make Sen. Sanders a featured speaker.
Are. You. Kidding. Me?
He dismissed Planned Parenthood—PLANNED PARENTHOOD—as "the Establishment" when they had the gall to endorse Hillary.