President-elect Joe Biden has formally introduced part of his national security team. On Tuesday, Biden spoke in Wilmington, Delaware, alongside secretary of state nominee Tony Blinken, national intelligence director nominee Avril Haines, homeland security secretary nominee Alejandro Mayorkas, national security adviser nominee Jake Sullivan and U.N. ambassador nominee Linda Thomas-Greenfield, who vowed to embrace multilateralism.

Linda Thomas-Greenfield: “My fellow career diplomats and public servants around the world, I want to say to you: America is back. Multilateralism is back. Diplomacy is back.”

Biden’s special envoy for climate, John Kerry, also spoke.

John Kerry: “To end this crisis, the whole world must come together. You’re right to rejoin Paris on day one. And you’re right to recognize that Paris alone is not enough.”

Biden has yet to decide on several key posts in his national security team, including defense secretary and CIA director. We will have more on Biden’s Cabinet picks after headlines.