As former U.S. President Jimmy Carter's funeral got underway, former presidents and first ladies were seen greeting each other before heading to their seats — but some pointedly avoided the Trumps

Joe Biden, Donald Trump, Barack Obama, George W. Bush and Bill Clinton — reunited at Jimmy Carter's funeral service in Washington, D.C., on Jan. 9. Obama and Trump held a long conversation at the start of the event,

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.”