As the 39th president is eulogized in Washington National Cathedral, Biden tells mourners his long-ago predecessor “taught me ... the strength of character.”

Mr. Carter said his spiritual rebirth was an “evolutionary thing” rather than “a flash of light or a sudden vision of God speaking.”

One of the first calls Obama made after U.S. forces killed Osama bin Laden in 2011 was to George W. Bush to spread the word that the mission had been accomplished, said Kate Andersen Brower, author of “Team of Five: The Presidents Club in the Age of Trump.”