oe Biden is jabbing at his top primary rival, Elizabeth Warren, and President Donald Trump coming out of Democrats' latest 2020 primary debate.
Biden hammered Warren for a lack of specifics about how she would fund a single-payer government health insurance system that she proposes.
The former vice president cast Trump as corrupt and challenged the president to release his tax returns.
Biden taunted Trump on Wednesday by noting in Ohio that even Richard Nixon released his tax returns before eventually being driven from office.
"Mr. President—release your tax returns, or shut up," Biden said.
Trump has spent weeks attacking Biden.
Warren has climbed in primary polls for months. But the Massachusetts senator is facing increasing scrutiny because she has not said whether middle-class tax increases would be required for a "Medicare for all" insurance plan.
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