DENVER -- Mike Pence is urging supporters in battleground Colorado to convince their neighbors to vote for Donald Trump. But the Indiana governor and Trump's running mate declined to echo Trump's claim that the election could be "rigged."

A man in the audience at a rally in Denver on Wednesday said Hillary Clinton had stolen delegates from Bernie Sanders and asked Pence what the campaign was going to do to prevent her from stealing the election. Pence didn't comment on the claim and said the campaign was working closely with state elections officials across the country to "ensure ballot integrity."

He urged Trump supporters to volunteer to help at the polls to make sure the election is conducted fairly.

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