Hillary Clinton

Investigators with the FBI have recovered a trove of personal and work-related Hillary Clinton emails that had been thought to have been deleted and lost from a private computer server, one source familiar with the investigation tells NPR's Carrie Johnson.

The recovery might mean that those emails may one day become public.

Hillary Clinton formally resigned as the 67th secretary of state, just moments ago.

In a letter to President Obama, she said it was an "honor to serve."

"I am more convinced than ever in the strength and staying power of America's global leadership and our capacity to be a force for good in the world," she said.

She concluded, "On a personal note, it has been a pleasure to work with you and your team. Thank you, Mr. President, for your friendship, and for the opportunity to serve in your Cabinet."