US Republican presidential nominee Donald Trump has said the election is "absolutely rigged" by the "dishonest media" and "at many polling places".
His comments appear to contradict his running mate Mike Pence, who told NBC Mr Trump would "absolutely" accept the election result, despite media "bias".
Mr Trump's adviser Rudy Giuliani has also accused Democrats of "cheating".
Mr Trump has questioned the legitimacy of the election process in a series of tweets, the latest of which said on Monday: "Of course there is large scale voter fraud happening on and before election day.
"Why do Republican leaders deny what is going on? So naive!"
Republican presidential candidate Donald Trump says those who cast doubt on his claims that next month's US elections will be rigged are "so naive".
www.bbc.com
Now he is rigging it for republicans to make sure they win.