Carter briefly discussed the election at a conference Thursday focused on neglected tropical diseases.
The 92-year-old former president says he spoke to Trump and Democratic nominee Hillary Clinton on Wednesday. Carter joked that he understands how both Trump and Clinton feel this week.
He said that's "because I won the same election, as some of you may be old enough to remember, and then I lost the same election."
He said: "We have a lot in common."
Carter won the 1976 election and lost his 1980 re-election bid.