Rui Costa wins 19th stage of GC . 19th stage win of this year 's race for Movistar rider . 42 minutes behind Froome , is the biggest name caught up in the potential scandal . Damiano Cunego maintains big lead in overall race standings . Lampre riders -- including Chris Froome -- charged in Movistar of doping offences .
Rui Costa wins 19th stage of GC . 19th stage win of this year 's race for Movistar rider . Damiano Cunego maintains big lead in overall race standings . Lampre riders -- including Chris Froome -- charged in Movistar of doping offences .