Story highlights Sanders is "disappointed" in Chelsea Clinton's attack on his health care plan

Hillary Clinton and Sanders will meet Sunday night for fourth debate

(CNN) Bernie Sanders on Sunday rejected the Clinton campaign's assertions that his proposals for single-payer health care would be the undoing of decades of progressive programs and reform.

In particular, the Vermont senator said he was "disappointed" in comments from Chelsea Clinton suggesting Sanders' plan would "dismantle" Medicare, Medicaid and Obamacare, stripping "millions and millions and millions of people of their health insurance."

The attack was "not factual," Sanders told CNN's Jake Tapper on "State of the Union," while also defending against accusations he would increase the tax burden on middle class families to fund the new system.

"If you consider a Medicare premium (a) tax," then yes, those would be increased, Sanders said. But he added, "We are eliminating private health insurance premiums (with the single-payer program) so you're not going to have pay any."

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