washington head democratic national committee saturday vow ensure candidates equal chance win democratic presidential nomination former party chair accuse committee rig process aid hillary clinton 2016. dnc chairman tom perez say statement 2020 nominate process would unquestionably fair transparent perez make comment former dnc chairwoman donna brazile say opinion piece politico early week nomination process rig clinton favor sign fundraise agreement dnc 2015. clinton former u.s. senator first lady beat senator bernie sanders nomination lose election republican donald trump november 2016. senator elizabeth warren massachusetts democrat tell cnn week perez need assure democrats include supporters sanders process fair agree 2016 nominate process rig perez say commit ever restore voters faith democratic process even perception impartiality unfair advantage undermine ability win unacceptable sanders campaign manager jeff weaver tell cnn week think debate schedule rig perez say party decide debate schedule advance instead negotiate candidates enter race joint fundraise agreements transparent leak email 2016 suggest party actively favor clinton sanders former clinton campaign manager robby mook friday deny nomination rig clinton favor hillary clinton primary almost million vote mook tell cnn idea dnc could rig contest frankly laughable brazile replace former dnc chairwoman debbie wasserman schultz last year furor content leak email also write contemplate propose replace clinton party 2016 presidential nominee washington post report saturday post say consider replace clinton then-vice president joe biden clinton faint september 2016. soon-to-be publish book brazile recount deliberations interim dnc chair whether initiate process remove clinton run mate tim kaine virginia senator post report say ultimately seek remove dnc rule give party chair ability call special meet consider replace nominee event death resignation disability candidate officially nominate full dnc power fill vacancies brazile book hack inside story break-ins breakdowns put donald trump white house release tuesday hachette book democratic leader vow fair nomination process 2020 uproar