But for the first time since the start of then anti-ISIS offensive dubbed Operation Inherent Resolve, the president volunteered a scenario which he said would change his mind.
“If we discovered that [ISIS] had gotten possession of a nuclear weapon, and we had to run an operation to get it out of their hands, then, yes,” the president told reporters at a news conference in Brisbane, Australia, on Sunday. “I would order it.”
There is no indication that ISIS currently possesses or could easily obtain a nuclear weapon, officials say.
Still, Obama’s declaration of a nuclear weapon in the hands of ISIS is a noteworthy new “red line” – and a very high bar for a U.S. offensive role on the ground.
“Yes, there are circumstances in which [Dempsey] could envision the deployment of U.S. troops. That’s true everywhere, by the way,” Obama said Sunday. “That’s his job, is to think about various contingencies. And, yes, there are always circumstances in which the United States might need to deploy U.S. ground troops.”
ABC News’ Luis Martinez contributed to this report