“I think several of our candidates could win the popular vote but as I know … that’s not enough,” added the 2016 Democratic nominee.

“I don’t think we have a choice; we have to win” in 2020, she said, speaking alongside her daughter and co-author Chelsea Clinton at a sold-out event.

She urged a supportive crowd of almost 2,000 people to “work hard for your preference in the primary” but “close ranks behind whoever is nominated.”

“Do not let anyone you know vote third party,” she said.