Former Michigan Rep. John Dingell suffered a heart attack Monday morning, according to his wife and congressional successor Democratic Rep. Debbie Dingell.

“It appears John Dingell had a heart attack early this morning,” Debbie Dingell said in a statement. “He’s alert and in good spirits, cracking jokes like always. He’s in the process of being admitted to Henry Ford Hospital. Our sincere thanks to all the medical professionals and nurses at our sides. We’ll know more later.”

John D. Dingell, 92, is the longest-serving member of Congress, serving from 1955 till his retirement in 2015.