Hillary Clinton was furiously fighting to keep her Presidential bid on track on Saturday night as her lead in the polls narrowed, after the FBI's bombshell announcement that it had reopened its investigation into her emails.

James Comey announced on Friday afternoon that fresh evidence had emerged for his investigation into whether Mrs Clinton was criminally negligent in her handling of classified material.

On Saturday, the latest poll of polls by tracker site RealClearPolitics put Clinton 3.9 percentage points ahead of the Republican nationwide, down from 7.1 points just 10 days previously.