Jimmy Carter has entered hospice care at his home in Plains, Georgia, turning down any more medical treatment after a recent series of hospitalizations. He was diagnosed with cancer in 2015. The 98-year-old Nobel Peace Prize laureate is the longest-living president in U.S. history and known for his active post-presidency, including his work with Habitat for Humanity and the Carter Center. He most recently joined efforts to protect the Izembek National Wildlife Refuge in Alaska. Click here to see our interviews with former President Jimmy Carter.