WASHINGTON — Republican Sen. Bill Cassidy is making an offer to Democrats he hopes they won’t refuse: If their states like ObamaCare, they can keep it.

A doctor who worked for decades in charity hospitals and clinics before joining Congress, Cassidy plans to introduce soon an updated version of his health care plan aimed at giving states flexibility to keep ObamaCare, nix it entirely or transition to a new system of health savings accounts and automatic health plan enrollment.

“You can go to the reddest state and say we have the option to root and branch it, and you can go to the bluest state and say we have the option to keep what we like,” the Louisiana Republican said. Under his plan, “Republicans say, ‘You have the option to keep your plan,’ and we mean it,” he added.

Republicans will need Democratic support to pass a full replacement for ObamaCare, and Cassidy’s approach may be the most likely to appeal to Democrats of the ones offered by the GOP so far.

“We should have a plan that isn’t Republican, that isn’t Democrat,” he said. “Our plan gives each state the authority to run the health plan in their state as is suitable to their peculiar situation, and that’s hard to argue with unless you want more power in Washington, D.C.”

“A reasonable person can say, I live in California, I love ObamaCare, this plan allows me to keep it. And I live in Arizona, my premiums just went up 100 percent and I have a chance to do something different.”

That’s a feature that other proposed replacement plans floating around — like that of Rep. Tom Price of Georgia, nominated to be secretary of Health and Human Services — don’t have.

Notably, Cassidy has a narrow view of what would count as “repeal” of the 2010 Affordable Care Act. He wouldn’t touch the changes it made to Medicare, nor would he eliminate the Medicaid expansion or the law’s taxes, at least not right away. But the federal mandates, which Cassidy said are what his constituents popularly think of as ObamaCare, would go away.

“They are concerned about the penalties, the mandates, the requirement to buy things they don’t need and therefore the escalating costs. If we address that, we’ve repealed ObamaCare,” Cassidy said in an interview. “They just hate the federal government telling them how to live their lives.”

There are roadblocks ahead, especially because he wants his fellow Republicans to delay repealing the law’s assorted tax hikes until they can be replaced as part of a broader tax overhaul later this year.

There are signs of a public outcry from constituents worried they will lose their insurance.