President Joe Biden, President-elect Donald Trump, and former presidents Barack Obama, George W. Bush and Bill Clinton all attended the state funeral.

All five living U.S. presidents are attending Jimmy Carter's funeral at the National Cathedral in Washington, D.C., on Thursday, a rare occurrence that marks the first time the leaders have gathered publicly since 2018.

Trump is obviously no fan of Biden, but Obama and his veep also have a famously complex relationship, only made more so after Obama helped nudge Biden to quit the presidential race last summer. Surely Obama feels some frustration that Biden fumbled a possibly winnable race; maybe he couldn’t help spill to his sworn enemy?