Kentucky Sen. Rand Paul says Donald Trump's plan to shut down parts of the Internet used by Islamic State jihadists would require a dissolvement of the First Amendment.

During Tuesday night's fifth and final Republican primary debate of 2015, Trump said he would "certainly be open to closing certain areas [of the Internet] where we are at war with somebody."

"I sure as hell don't want to let people who want to kill us and kill our nation use our Internet," he added.

"Closing the Internet would require a change to our Constitution where we get rid of the First Amendment. That's a big step," Paul said Wednesday on Fox News' "America's Newsroom."

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