“It is a disservice to the country for Bernie Sanders to say there will be more Social Security for everybody,” he told listeners during the Heritage Action Presidential Forum in Greenville, S.C.

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“There is no free lunch,” the 2016 GOP presidential candidate said. “That just means somebody else is paying for it and they’re not showing you who’s paying for it instead.”

“If Social Security is short of money, you can’t promise people more of it,” he added. “You have to figure out how to do it with less money.”

Paul said rampant, unchecked entitlement spending of any kind is detrimental to America’s future.

“We’re going to destroy the country if we do that,” he said.

Paul set his sights on his own party’s poor fiscal habits.

“I’ll tell you in Washington – most of the Republicans do not believe in lowering your taxes,” he said.

“Only a third of the Republicans in Congress had the guts to vote for the budget as it cut spending,” Paul added.

Paul admitted another point of contention he has with the GOP establishment is its fierce opposition to President Obama’s nuclear pact with Iran.

He charged that his Republican presidential rivals are taking unrealistic stances on the agreement heading into next year’s election.

“Some of them want to rip it up and tear it up and put it in a shredder and stomp on it,” Paul said of the GOP presidential field.

“I’m different from the other Republicans,” he said. “I think that’s theatrics for the people who say they want to tear it up. There is a possibility for peace.”

Paul vowed that if he were elected president and the deal stood, he would consider how it is working before proceeding further, though he reiterated that he is dissatisfied with the final product.

“I thought the Iran agreement was a mistake,” Paul said. “I don’t think there’s enough leverage in the agreement to get them to apply.”

The Obama administration announced its historic nuclear deal with Iran last June.

It eases economic sanctions Iran in exchange for greater restrictions on its atomic energy capabilities.

Paul’s remarks come as he struggles for support in the GOP race.