President Obama found himself defending the country’s current strategy against ISIS at the G20 summit in Antalya, Turkey on Monday (Nov. 16). In response to naysayers who have been “talking as if they’re tough,” Obama offered reasoning for why on-ground troops have not been sent to Syria, noting that the terrorist group should not be treated as their own state.

“This is not conventional warfare. We play into the ISIL narrative when we act like they are a state,” he said. “We use routine military tactics that are designed to fight a state that is attacking another state. That’s not what’s going on here. These are killers with fantasies of glory.”

Republican candidates Ben Carson, Jeb Bush and Donald Trump have all placed their two cents into the hat regarding Obama’s strategy. Carson criticized the U.S. military’s withdrawal from Iraq, stating that it led to the formation of ISIS. Bush suggested that only Christian refugees be allowed into the country, while Trump proclaimed that he would “bomb the s**t” out of ISIS.

“The strategy that we’re putting forward is the strategy that is ultimately going to work,” Obama said. “But as I said, it’s going to take time.”

As for people who have such strong stances on his plan, Obama challenged them to come strategies of their own: “Folks want to pop off and have opinions on what they think they would do, present a specific plan,” he said.