US President-elect Joe Biden has introduced veteran diplomats and policymakers who will make up his national security and foreign policy team, saying: “America is back, ready to lead the world.”

Biden, 78, at an event in his home town of Wilmington, Delaware, presented his choices for secretary of state, national security adviser, homeland security secretary, intelligence chief, UN ambassador and climate change envoy.

“It is a team that will keep our country and our people safe and secure,” Biden said as the six men and women stood behind him wearing face-masks on the stage of the Queen Theatre.