Donald Trump on Monday doubled down on his belief that the 2016 presidential election will be fixed and called the Republican Party "naïve" to say voter fraud is not occurring on a large scale.

In two Monday morning tweets, the GOP presidential candidate blasted the party that nominated him, but predicated members will all "come together" to defeat Democrats:

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! — Donald J. Trump (@realDonaldTrump) October 17, 2016

We have all got to come together and win this election. We can't have four more years of Obama (or worse!). — Donald J. Trump (@realDonaldTrump) October 17, 2016

The latest missives come a day after Trump took to Twitter to allege election results were being "rigged" at many polling places.

And it flies in the face of the declaration by his vice presidential running mate Mike Pence that Republicans will accept the results of the Nov. 8 contest between Trump and Democratic rival Hillary Clinton.

Republican leaders have reportedly warned Trump not to claim massive voter fraud but the billionaire business tycoon has repeatedly ignored the advice.

On Sunday, Trump also launched a jab at Republican House Speaker Paul Ryan who is no longer defending or campaigning for Trump, saying on Twitter: