His stunning claim came at the end of a pointed lecture recounting the conditions that led the regional militant group called al-Qaeda in Iraq to grow its ambitions and blaming the president for creating the power vacuum that terrorists rushed in to fill.
'In many respects, you know, they honor President Obama. ISIS is honoring President Obama,' Trump said, working himself into a lather at the end of a full day of campaigning in two states.
'He is the founder of ISIS. He is the founder of ISIS, okay? He's the founder! He founded ISIS!' he continued, always crescendoing.
'And I would say,' Trump added more solemnly, getting to his election-year point: 'The co-founder would be crooked Hillary Clinton. Co-founder! Crooked Hillary Clinton! And that's what it's about!'
Trump has made claims before that Obama precipitously pulled U.S. forces out of Iraq on a predetermined date, giving ISIS room to breathe and expand.
But Wednesday marked the first time he has credited the current White House with the creation of the self-described 'Islamic State.' What a statement.