Donald Trump roiled the US presidential campaign once again, with the jaw-dropping assertion that Hillary Clinton and President Barack Obama "founded" the IS group. Addressing supporters at a rally in Fort Lauderdale, Florida, the real estate tycoon said the jihadist group is "honoring President Obama. He is the founder of ISIS," Trump said, using a term for IS. "He's the founder of ISIS, okay?" he added. "He's the founder! He founded ISIS. And I would say, the co-founder would be 'Crooked Hillary Clinton,'" Trump shouted, over cheers and applause from the crowd.