U.S. Rep. John Dingell

File photo of Rep. John Dingell  (Photo by Chip Somodevilla/Getty Images)

Dingell, Longest-Serving Congressman, To Retire

U.S. Rep. John Dingell, the longest-serving member of Congress in American history who mastered legislative deal-making and was fiercely protective of Detroit’s auto industry, will announce his retirement on Monday, a person familiar with his plans said.