The Latest: Trump calls GOP leaders 'naive' on voter fraud

INDIANAPOLIS (AP) - The Latest on Mike Pence in the U.S. presidential race (all times EDT):

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9:20 a.m.

Donald Trump is calling Republican leaders "naive" for dismissing his claims of a rigged election and urging his supporters to "come together and win this election."

His comments came in a series of tweets Monday.

There is no evidence voter fraud is a widespread problem in the United States. House Speaker Paul Ryan says he is confident the election will be conducted with integrity.

On Sunday, Trump's running mate, Mike Pence said Trump's claims of a rigged election refer to media bias.

Trump tweeted 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!"

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8:45 a.m.

Republican vice presidential candidate Mike Pence is starting the week with campaign stops in Ohio, while his Democratic counterpart Tim Kaine plans to return to the battleground state on Wednesday.

Pence is scheduled to hold rallies in Mason and Columbus on Monday afternoon.

Hillary Clinton's campaign said Kaine will be in Columbus and Springfield on Wednesday.

After a lull last month, high-level campaigning has accelerated in what polls indicate is a tossup state.

Trump campaigned in the state last Thursday, while President Barack Obama and former president Bill Clinton followed Democrat Hillary Clinton's return to the state last week with campaign appearances.

While Hillary Clinton appears to have paths to the total needed for election without Ohio, the state's 18 votes are considered crucial for Trump.

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3:20 a.m.

Donald Trump's top supporters are racing to explain that what Trump said or tweeted isn't what he meant - especially on his claim without evidence that the Nov. 8 presidential election is "rigged" in Democrat Hillary Clinton's favor.

Trump's running mate Mike Pence said Sunday they'll "absolutely accept the results of the election."

But Trump is continuing to warn, without evidence, about vote fraud.

After Pence spoke, Trump tweeted: "The election is absolutely being rigged by the dishonest and distorted media pushing Crooked Hillary - but also at many polling places - SAD."