As he's said before, Trump faulted Clinton’s policies and decision-making while at the State Department, saying they enabled ISIS to gain a foothold in the Middle East. It's an accusation her campaign has vigorously denied.
“President [Barack] Obama and Secretary Clinton created a vacuum the way they got out of Iraq, because … the way they got out was a disaster,” Trump said during the debate at Hofstra University in Hempstead, New York. “She's been trying to take them out for a long time.