With three weeks of campaign work left until Election Day, Donald Trump continues to charge that his candidacy for President is being undermined by large amounts of voter fraud, as he has stepped up his very public allegation that the 2016 election is rigged against him.

On Sunday, he repeatedly accused the news media of rigging the election; on Monday, he was taking aim at fellow Republicans over the issue.

In a number of swing states, Republicans are the ones in charge of making sure the vote is fair - like in Ohio, where the Secretary of State was on television today expressing confidence in the system:

Back in August, the elections officials in charge of Florida's vote count made clear in a statement that they see no evidence that an election could be fixed against anyone.

"I think that it would be virtually impossible," said the group's counsel, as many election experts say the warnings by Trump of a rigged election - or widespread voter fraud - just aren't so.

But for Trump, the charge that the election is rigged, is a common staple of his stump speech.

And it has certainly been picked up by his supporters.

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Credit: Jamie Dupree

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Credit: Jamie Dupree

Trump has also asked his backers to check out polling places on Election Day for possible fraud, citing the city of Philadelphia several times at rallies in recent weeks.

"And everybody knows what I'm talking about," Trump said last week in Pennsylvania.