Former Defense Secretary James Mattis said that President Trump's decision to pull troops from northern Syria could lead to a comeback for the Islamic State.
"We have got to keep the pressure on ISIS so they don't recover," Mattis said in a Saturday preview for Sunday's Meet the Press on NBC. "We may want a war over; we may even declare it over. You can pull your troops out, as President Obama learned the hard way, out of Iraq, but the 'enemy gets the vote,' we say in the military."
He added, "And in this case, if we don't keep the pressure on, then ISIS will resurge. It's absolutely a given that they will come back."
Mattis' criticism follows Trump's decision this week to pull troops from the northern border of Syria near Turkey. The area is occupied by U.S. allies, the Kurds, who have helped fight ISIS.
Turkey announced plans Wednesday to begin an invasion of the territory. Both Republicans and Democrats have accused Trump of abandoning an American ally as a result.