Republican presidential frontrunner Donald Trump revealed on Sunday that his plan for replacing President Barack Obama's Affordable Care Act was to "work something out" after he repeals Obamacare.

During a telephone interview on ABC's This Week, host George Stephanopoulos asked Trump to answer Ted Cruz's charge that he was advocating for a single-payer health insurance system to replace the Affordable Care Act.

"Ted Cruz is a total liar," Trump replied dismissively. "I am so against Obamacare. I've been saying it for two years in my speeches. I'm going to repeal and replace Obamacare. I don't know even where he gets this. But he's a liar."

Stephanopoulos pointed out that Trump was on record wanting everyone to be covered by health care insurance.

"That's true," Trump insisted. "I want people taken care of, I have a heart. If people have no money, we have to help people, but that doesn't mean single payer. It means we have to help people."

"How do you do it?" the ABC host asked.

"We're going to work with our hospitals, we're going to work with our doctors," Trump said. "We've got to do something. You can't have a small percentage of our economy -- because they're down and out -- have absolutely no protection so they end up dying."

"We'll work something out," he added. "That doesn't mean single payer."