Sanders to Tim Ryan: 'I do know that, I wrote the damn bill'

White House hopeful Sen. Bernie SandersBernie SandersThe Hill's Campaign Report: US officials say Russia, China are looking to sow discord in election Warren urges investment in child care workers amid pandemic Progressive candidate Bush talks about her upset primary win over Rep. Clay MORE (I-Vt.) rebuked his presidential opponent Rep. Tim RyanTimothy (Tim) RyanThe Hill's Coronavirus Report: HHS Secretary Azar says US plans to have tens of millions of vaccine doses this fall; Kremlin allegedly trying to hack vaccine research Democrats see victory in Trump culture war House Democrat calls for 'real adult discussion' on lawmaker pay MORE (D-Ohio) after Ryan questioned how comprehensive his “Medicare for All” platform would be.

Sanders maintained that his Medicare for All platform would offer more comprehensive health care coverage for people who would eventually lose their private plans, noting that it would include dental and vision plans for seniors as well as other facets, to which Ryan responded “You don’t know that, Bernie.”

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“I do know that, I wrote the damn bill,” Sanders fired back to applause, referencing the Medicare for All bill he’s introduced in the Senate.

The exchange was part of a longer, fiery debate among the field about the federal government’s role in providing health care, with Sanders and Sen. Elizabeth WarrenElizabeth WarrenDemocratic convention lineup to include Ocasio-Cortez, Clinton, Warren: reports Whitmer met with Biden days before VP announcement: report The Hill's Campaign Report: US officials say Russia, China are looking to sow discord in election MORE (D-Mass) supporting a Medicare for All platform

But several moderates touted different plans that would allow Americans to keep private insurance and either expand the Affordable Care Act or include a public option to supplement private plans.

“Why do we got to be the party of taking something away from people?” former Rep. John DelaneyJohn DelaneyCoronavirus Report: The Hill's Steve Clemons interviews Rep. Rodney Davis Eurasia Group founder Ian Bremmer says Trump right on China but wrong on WHO; CDC issues new guidance for large gatherings The Hill's Coronavirus Report: Kansas City Mayor Quinton Lucas says country needs to rethink what 'policing' means; US cases surpass 2 million with no end to pandemic in sight MORE (D-Md.), a staunch centrist, asked during the debate.

Polling has showed that health care has emerged as a top issue for Democratic voters, though what should be the solution to rising premiums and scant coverage has produced a sharp divide within the primary field.