Barack Obama
The pair slammed President Joe Biden and Vice President Kamala Harris, among others, in their simulated conversation.
A two-second clip of the moment between the former presidents has been viewed tens of millions of times.
The president-elect said he "didn't realise" one thing about the exchange at Jimmy Carter's funeral until he saw footage of it.
The president-elect sat in the row directly ahead of Mike Pence, who was once the target of a violent mob bent on keeping Trump in power.
Trump damaged the Obama economy he inherited with his trade war, and now appears poised to repeat that move with the Biden economy.
Hillary and Bill Clinton also issued a statement, warning Americans what they do next will "make the difference between a nation that moves forward or one that falls back."
The former president spelled out what "real strength" means to him and the GOP nominee's version definitely wasn't it.
The former president spoke about Trump's handling of the Covid-19 pandemic during a recent rally in Las Vegas.
“You would be worried if your grandpa was acting like this,” Barack Obama joked.
The former president joked about his successor as he spoke about the cost of child care.