Trump says he'll score 'big win'

Republican President Donald Trump, in a tweet early on Wednesday, predicts he will win a second four-year term and accused Democrats of attempting to "steal" the election from him, without citing any evidence.

"We are up BIG, but they are trying to STEAL the Election. We will never let them do it," Trump tweeted, adding, "A big win" for re-election.

His tweets came immediately after a statement from Democratic presidential candidate Joe Biden, who said he was optimistic about his prospects of winning.