In honor of President's Day, we've rounded up the best photos of former US presidents enjoying each other's company.

Bush's appearance at the inauguration comes just weeks after he and the other former presidents sat together at Jimmy Carter's funeral. See pictures of former President Bush at the inauguration below.

The inside story of how all five living former U.S. presidents came together in one video to raise donations for Hurricanes Harvey and Irma relief In these divided political times, you might think ...