Referencing the mass murder that occurred under Joseph Stalin and Mao Zedong, Republican presidential candidate Rand Paul said Americans should be wary of the socialism of Vermont Sen. Bernie Sanders, who is running for president as a Democrat.

"I think it's very important for Americans not to succumb to the notion that there's anything sexy or cool about socialism," the senator from Kentucky said.

"Bernie's a socialist and ultimately socialism relies on force or implied force and it's, you know, [it] wasn't an accident that Stalin killed millions of people or Mao Zedong killed millions of people because you want to control the economy and you want to control ownership of things by the state. You have to forbid other people from owning parts of the economy or controlling parts of the economy."

Paul also said be concerned about who is going to pay for Sanders' policy proposals.

"So I think it's really important that people understand that there is no free lunch when Bernie offers you something for free. He's going to take it from somebody else first and then all they're doing is obscuring who pays for it, but ultimately somebody has to pay for things. And so if you want free college for those that go to college, those that don't go to college and work will be paying for your college. So nothing's really on the surface. What appears to be free isn't free," Paul said.