Democratic presidential contender Elizabeth Warren says she'll release details on how she'd pay for her "Medicare for All" plan in "the next few weeks."

The Massachusetts senator came under criticism from her opponents during last week's Democratic primary debate for refusing to say whether her plan would raise taxes on the middle class to pay for expanding Medicare to the entire nation. At a campaign event in Indianola, Iowa, on Sunday, Warren said: "What I see is that we need to talk about costs." She says she'll outline those costs and how to cover them soon.

Democratic rival Bernie Sanders has acknowledged that his plan to expand Medicare to everyone would require higher taxes on the middle class while eliminating most health care expenses for the public.

With files from the Associated Press

Guests:

Misyrlena Egkolfopoulou, reporter covering Elizabeth Warren's campaign and the 2020 election for Bloomberg News; she tweets

Allison Hoffman, professor of Law at University of Pennsylvania Law School; senior fellow at the Leonard Davis Institute of Health Economics at UPenn; co-editor of “The Oxford Handbook of U.S. Health Law” (Oxford University Press, 2017)

Joe Antos, health policy expert and health economist at American Enterprise Institute, a libertarian-mind think tank in DC