Donald Trump handily won Indiana's GOP primary in May. Getty Images

Republican presidential nominee Donald Trump has said widespread voter fraud is occurring and that his battle with Democrat Hillary Clinton is “rigged” even though there have been no such reports of fraud of date. Until, possibly, Tuesday.

Some Indiana voters have reached out to their secretary of state to decry misinformation on their voter registration, like birth dates or even their first names. The state did not have an immediate explanation for the changes, according to local NBC affiliate WTHR.

Because some of the vital information was changed, voters who went to — the state’s registration hub — were afraid they weren’t registered for one of the most contentious and perceived important elections in U.S. history.

"We ran a report in the Statewide Voter Registration System and found thousands of dates of births and first names were changed," Indiana’s Secretary of State Connie Lawson said to WTHR. "These records were changed on paper forms, at the BMV and online. At this time, my office is not sure why these records were changed, but we have evaluated the Statewide Voter Registration System and have found no indication it has been compromised. We believe this may be a case of voter fraud and have turned our findings over to the State Police, who are currently conducting an investigation into alleged voter fraud."

Indiana voters who couldn’t confirm they were registered did not vote in the state’s presidential primary, which is why the issue is only popping up now. Those who did participate in the primary have been asked to contact local election officials, according to WTHR.

Indiana’s voter registration deadline passed a week ago, Oct. 11.

Trump, who many believe has gradually increased accusations of voter fraud and a “rigged election” in order to draw voters’ attention away from several accusations of sexual assault made against him in the last two weeks, is well ahead of Clinton in Indiana, according to The pollster site shows Trump up as much as 52 percent compared to Clinton in a state worth 11 electoral votes. Trump also overwhelmingly beat out his Republican rivals in Indiana’s primary back in May, earning 53.3 percent of the vote compared to Ted Cruz’s 36.6 percent.

Speaking at a rally in Green Bay, Wisconsin on Monday, Trump said the accusations of sexual assault were completely false before pivoting to the topic of voter fraud.

“Oh, what a waste...oh, what a waste. They all say it won’t be a waste, you’ll be in the history books. Let me tell you something folks, I don’t wanna be in the history books…I want to win,” Trump said according to CBS News. “People that have died ten years ago are still voting, illegal immigrants are voting.”

However, while Trump cited studies and research from 2012 and 2008’s elections that suggested more than 20 million cases of voter fraud had occurred, other studies have largely debunked those claims.

FBI special agent in charge Aaron Rouse, speaking to reporters in Nevada on Tuesday, also addressed Trump’s accusations, calling them "dangerous" and insisted Nevada’s electronic voting systems are very secure, according to Politico.