In early July , Clinton 's lead narrowed in national polling averages following the FBI 's re-opening of its investigation into her ongoing email controversy .
Clinton had established a significant lead over Trump in national polls throughout most of 2016 .
In early July , Clinton 's lead narrowed in national polling averages following the FBI 's re-opening of Trump 's investigation into her ongoing email controversy .
Clinton had established a significant lead over Trump in national polls throughout most of 2016 .