As Trump airs his election doubts, many supporters say they won't accept a Biden win in 2024

More than six months out from the presidential election, many Republican voters harbor deep doubts not only about whether President Joe Biden is fit for a second term — but also about whether he can even win re-election fair and square.

“I think that the powers that be on the Democratic side have figured out a way to circumvent democracy,” said Darlene Anastas, 69, of Middleborough, Massachusetts.

Poll after poll has found that a large proportion of the Republican electorate believes the only reasons Joe Biden is president are voter fraud and Democratic dirty tricks, buying into former President Donald Trump’s baseless claims about the 2020 election.

Trump continues to stoke those fires on the campaign trail.

He frequently airs false claims about his 2020 election performance and has leaned into defending his supporters who rioted at the U.S. Capitol on Jan. 6, 2021. In an interview with Time this week, he said he would have trouble hiring anyone who believes Biden legitimately won in 2020: “I wouldn’t feel good about it.”

And on Wednesday, Trump said he may not accept the presidential election results this time, either.

"If everything's honest, I'd gladly accept the results," Trump told the Milwaukee Journal Sentinel. "If it's not, you have to fight for the right of the country."

The doubts Trump pushed last time around resulted in Jan. 6 and linger to this day. Now, there is a fresh cycle of skepticism, pushed again by Trump and many others in the Republican Party. And the views have firmly taken root with many of their followers, as interviews with 50 Republican voters across a dozen states showed.

The majority of voters who spoke with NBC News said they weren’t prepared to accept a Biden victory as legitimate,