Rand Paul in The Wall Street Journal

On War & Peace: Hillary's War: Ousting Gadhafi in Libya gave rise to ISIS

Paul said Hillary Clinton was to blame for what he described as foreign-policy failures: she was a proponent of interventions during popular uprisings against the ruling regimes in Libya and Syria. "Hillary's war in Libya has been an utter disaster," Paul said. "There are now jihadists roaming all across Libya. It's a jihadist wonderland."

The US was part of an international coalition to oust Libyan leader Moammar Gadhafi from power in 2011. "Gadhafi was a secular dictator," Paul said. "Not the kind of guy that we want to have representing us in country, but he was secular. He didn't like radical Islam, and he kept them down because they were a threat to him. What happened when we toppled the secular dictator? Chaos. More radical Islam."

On War & Peace: Supporting rebels in Syrian Civil War gave rise to ISIS

In Syria, Paul said that Islamic State--a militant group operating in Syria and Iraq that is also known as ISIS--was essentially created by the US aid program under the Obama administration. "I think we have to do something about ISIS," he said. "But, you know why we're doing something and why we have to be there again? Because of a failed foreign policy that got us involved in a Syrian Civil War. By supporting the Islamic rebels, ISIS grew stronger and stronger. And now we have to go back."