Cleveland ? Former President Jimmy Carter, on a trip promoting his new book, developed an upset stomach on a flight to Cleveland on Tuesday and was staying at a hospital overnight at his doctor’s recommendation.

Carter’s grandson, Georgia state Sen. Jason Carter, said his 85-year-old grandfather was doing fine.

“He’s definitely resting comfortably and expected to continue his book tour this week,” Jason Carter said. “I haven’t talked to him, but nobody in the family is concerned.”

Carter was a passenger on a Delta Air Lines flight from Atlanta to Cleveland when he became ill. After the plane landed, he was taken off by rescue crews, said Jackie Mayo, a spokeswoman at Cleveland Hopkins International Airport.