In all major national polls, Hillary Clinton is leading Donald Trump by more than seven points.
Slamming Republican presidential nominee Donald Trump for questioning free and fairness of the American electoral system, the rival Clinton Campaign has said the November 8 general elections would register a record voter turnout.
"This election will have record turnout, because voters see through Donald Trump's shameful attempts to undermine an election week before it happens," said Clinton Campaign manager Robby Mook.
"Campaigns should be hard-fought and elections hard-won, but what is fundamental about the American electoral system is that it is free, fair and open to fair and open to the people," he said.
"Participation in the system and particularly voting should be encouraged, not dismissed or undermined because a candidate is afraid he's going to lose," Mr Mook alleged.
In all major national polls, Ms Clinton is leading Mr Trump by more than seven points.
She has received endorsements from all major American publications.
If elected, she would be the first woman to be elected as the president of the United States.