President Obama calls the upcoming climate summit with world leaders in Paris a “powerful rebuke” to Islamic State terrorists who attacked the city earlier this month.

“What a powerful rebuke to the terrorists it will be, when the world stands as one and shows that we will not be deterred from building a better future for our children,” Obama marveled, after previewing his attendance at the summit which begins next week in Paris.

Obama made his remarks during a press conference at the White House today with French President François Hollande. He urged Americans to come together and be united against the threat of terrorism worldwide.

“We cannot, and we will not succumb to fear,” he said. “Nor can we allow fear to divide us. For that’s how terrorists win.”