President Barack Obama has reiterated that there will be no U.S. ground troops in the military campaign against ISIS in Syria. On Monday, the U.S. president said that deploying American ground troops to fight ISIS in Syria would be a "serious mistake," according to CNN.

"It's best that we don't shoot first and aim later," Obama said at a press conference on the sidelines of the G20 summit in Antalya, Turkey, according to the Guardian.

"Not because our military could not march into ... Raqqa and temporarily clear out ISIL, but because we would see a repetition of what we've seen before. If you do not have local populations that are committed to inclusive governance and who are pushing back against ideological extremes, then they resurface," he said, according to CNBC.

Obama, however, promised that the U.S. strategy against the brutal Sunni jihadist group would deliver desired results, but that it is going to take time.

"There will be an intensification of the strategy that we put forward, but the strategy that we are putting forward is the strategy that ultimately is going to work. But as I said from the start, it's going to take time," he said, according to Bloomberg.

Obama made the remarks after the ISIS-inspired terror attacks in Paris left at least 129 people dead. Obama's critics have demanded a more aggressive strategy against ISIS in Syria since the carnage in Paris.