Oprah Winfrey and David Letterman among moderators for Michelle Obama tour

Former US First Lady Michelle Obama (Kirsty O’Connor/PA)

Oprah Winfrey, David Letterman and Ellen DeGeneres are among the celebrity moderators joining former first lady Michelle Obama on a US tour for her upcoming book, The Light We Carry: Overcoming In Uncertain Times.

Other guests include Conan O’Brien, Tracee Ellis Ross, journalists Gayle King and Michelle Norris, Today show host Hoda Kotb, poet Elizabeth Alexander and advocate Heather McGhee.