Carl Icahn's feud with former protégé imperils Navistar sale

Carl Icahn has been squabbling with a former protégé in negotiations to sell a truck-making giant -- and investors fret that the tiff could land the deal in a ditch. The 84-year-old billionaire is squaring off against Mark Rachesky -- a hard-charging financier who worked for him for six years in the 1990s -- over...