Former President Jimmy Carter and his wife, Rosalynn Carter, right, work at a Habitat for Humanity building site Monday, Nov. 2, 2015, in Memphis, Tenn. Carter and his wife, Rosalynn, have volunteered a week of their time annually to Habitat for Humanity since 1984, events dubbed “Carter work projects” that draw thousands of volunteers and take months of planning. (AP Photo/Mark Humphrey)
Former President Jimmy Carter and his wife, Rosalynn Carter, right, work at a Habitat for Humanity building site Monday, Nov. 2, 2015, in Memphis, Tenn. Carter and his wife, Rosalynn, have volunteered a week of their time annually to Habitat for Humanity since 1984, events dubbed “Carter work projects” that draw thousands of volunteers and take months of planning. (AP Photo/Mark Humphrey)