Michigan Congressman John Dingell is undergoing a “minimally invasive procedure” today.
The 87-year-old Democrat recently developed atrial fibrillation.
A press release from Dingell’s office says the procedure will seek to find the source of the abnormal heart rhythm, and correct it.
Dingell is expected to spend the night at Henry Ford Hospital in Detroit.
The 29-term congressman recently announced he will not seek reelection to his southern Michigan seat.
Dingell has represented Michigan in Congress since the mid-1950’s.