WASHINGTON (AP) — The Trump administration's Medicare chief on Wednesday slammed Sen. Bernie Sanders' call for a national health plan, saying "Medicare for All" would undermine care for seniors and become "Medicare for None."

The broadside from Medicare and Medicaid administrator Seema Verma came in a San Francisco speech that coincides with a focus on health care in contentious midterm congressional elections.

Sanders, a Vermont independent, fired back at Trump's Medicare chief in a statement that chastised her for trying to "throw" millions of people off their health insurance during the adm...