John Kerry hailed the contribution of outgoing Secretary of State Hillary Clinton at his official swearing in ceremony in Washington.
"I want to thank Secretary Clinton for the unbelievably high standard of energy, commitment and vision that she set in her superb stewardship of the US State Department," said Kerry.
The new Secretary of State also paid tribute to Barack Obama, saying: "The President has restored American's place and our reputation in the world."
More top news
At 14, Benji Edwards is hoping to become the youngest person to ever sail around the North Pole and break a world record in the process.
Bob and Mike Bryan said they were withdrawing from the Games over concerns for their families health.
The former boss of BHS said a parliamentary committee that investigated the closure of the stores was a 'kangaroo court'.