Defense Secretary Jim Mattis downplayed reports that the Pentagon was considering deploying US ground combat troops to Iraq and Syria, but he didn’t rule it out.

Asked about a CNN report that the Pentagon might propose sending US troops to expedite the fight against ISIS, Mattis said he was not “comfortable answering on my own at this point” on the troop recommendation.

“I first want to talk to the other allies and we’ll decide where we’re going,” Mattis said from Brussels, after leading a defense-ministers meeting on the anti-ISIS campaign at NATO headquarters.

He said those discussions would begin soon.