CNN's David Gergen warned Democrats that “it's a strategic mistake” to have Sen. Bernie Sanders Bernie SandersNYT editorial board remembers Ginsburg: She 'will forever have two legacies' Two GOP governors urge Republicans to hold off on Supreme Court nominee Sanders knocks McConnell: He's going against Ginsburg's 'dying wishes' MORE (I-Vt.) participate in a debate against Sens. Lindsey Graham Lindsey Olin GrahamMcConnell locks down key GOP votes in Supreme Court fight Will Republicans' rank hypocrisy hinder their rush to replace Ginsburg? Momentum growing among Republicans for Supreme Court vote before Election Day MORE (R-S.C.) and Bill Cassidy William (Bill) Morgan CassidyCoushatta tribe begins long road to recovery after Hurricane Laura Senators offer disaster tax relief bill Bottom line MORE (R-La.) on Monday night before a national TV audience.



“If the Democrats make this a debate between single-payer and the Republican Graham/Cassidy bill, they will very likely lose that debate," said Gergen, a former adviser to Presidents Richard Nixon, Gerald Ford, Ronald Reagan and Bill Clinton William (Bill) Jefferson ClintonBattle lines drawn on precedent in Supreme Court fight Sunday shows - Ruth Bader Ginsburg's death dominates Bill Clinton on GOP push to fill Ginsburg vacancy: Trump, McConnell 'first value is power' MORE.

CNN announced Thursday that it will host a town hall-style debate Monday night where senators from both sides of the aisle will face off over the new ObamaCare repeal bill.

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The debate will pit Cassidy and Graham, the sponsors of the bill, against Sens. Bernie Sanders (I-Vt.) and Amy Klobuchar Amy KlobucharBattle lines drawn on precedent in Supreme Court fight Sunday shows - Ruth Bader Ginsburg's death dominates Klobuchar: GOP can't use 'raw political power right in middle of an election' MORE (D-Minn.).

Sanders just unveiled his own single-payer health-care bill, which he refers to as “Medicare to all.”

It would transform the country’s health-care system from one in which most people get health care through an employer to one in which all people would be covered by a universal, government-funded system akin to Medicaid.

While the single-payer idea has growing support on the left, including from a number of possible Democratic presidential candidates in 2020, it’s not clear that it has broad public support.

It would go much further than ObamaCare, which the Graham-Cassidy legislation would undo and replace with block grants that would be delivered to states.

Gergen argued that in having Sanders involved in the debate, Democrats risk moving the argument to terrain that will help the GOP by making it about single-payer vs. Graham-Cassidy, instead of the present system versus the GOP bill.

“It's a strategic mistake to allow that to happen,” he said. “[Democrats] must make it a debate between ObamaCare, the current existing system, which many Americans want to keep that, versus this radical change coming from Republicans.”

“They can win that debate. They would probably lose the single payer debate and the country would be transformed. But it's a Republican bill."

The event will be moderated by CNN anchor Jake Tapper and the network's chief political correspondent Dana Bash live from Washington, D.C.

The network will broadcast the event from Washington, D.C., on Monday at 9 p.m.