President Trump Donald John TrumpHR McMaster says president's policy to withdraw troops from Afghanistan is 'unwise' Cast of 'Parks and Rec' reunite for virtual town hall to address Wisconsin voters Biden says Trump should step down over coronavirus response MORE’s younger daughter, Tiffany Trump, is registered to vote in two different states, reports revealed Wednesday after her father categorized being registered in two states as "voter fraud."

The Washington Post and NBC News confirmed a report by Heat Street that Tiffany Trump is registered in both Pennsylvania and New York.

NBC News confirms Tiffany Trump is registered to vote in two states, New York & Pennsylvania. (That is NOT a crime.) https://t.co/Ijo5DjMtkY — Bradd Jaffy (@BraddJaffy) January 25, 2017

We've confirmed what @heatstreet reported, that @realDonaldTrump's daughter Tiffany is also registered to vote in 2 states, Pa and NY. https://t.co/REL4Y4lhr1 — David Fahrenthold (@Fahrenthold) January 25, 2017

Trump on Wednesday morning announced a "major investigation" into voter fraud. He cited "those registered to vote in two states" as part of the problem.

I will be asking for a major investigation into VOTER FRAUD, including those registered to vote in two states, those who are illegal and.... — Donald J. Trump (@realDonaldTrump) January 25, 2017

even, those registered to vote who are dead (and many for a long time). Depending on results, we will strengthen up voting procedures! — Donald J. Trump (@realDonaldTrump) January 25, 2017

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It is illegal to cast a ballot in multiple states, though it is not illegal to be registered in two states at the same time. It frequently happens when a person moves to a new state and registers at their new home, but their old state hasn't yet updated its voter rolls.

Tiffany Trump lived in Philadelphia while attending the University of Pennsylvania.

According to the report, she cast her November ballot in New York City.

CNN reported Wednesday that Steven Mnuchin, Trump's pick for Treasury secretary, is registered in both New York and California, although records show he last voted at his New York address in 2008.

The Sarasota Herald-Tribune reported that chief White House strategist Steve Bannon was also registered to vote in two states — New York and Florida.