President Donald Trump doubled down on claims that the November election is going to be a "disaster" because of mail-in ballots. But postal workers reportedly say it's the president's new postmaster general who is causing delivery delays.

With 94 days until Election Day, Trump continued his attacks on mail-in voting, with a series of unsubstantiated claims that increased mail-in voting would result in fraud.

"This is going to be the greatest election disaster in history," says Trump. "Everyone knows mail-in ballots are a disaster."

Trump is currently trailing Joe Biden in national polls. Recent polls from NBC, FOX and ABC all have Biden ahead by at least eight points.

Trump has compared mail-in ballots to foreign interference.

"You guys like to talk about Russia and China and other places. They'll be able to forge ballots. They'll forge 'em, they'll do whatever they have to do," says Trump.

The president has also said it will take too long to count the votes if Americans cast their ballots by mail.

His comments come as U.S. postal workers and union leaders are sounding the alarm that new, cost-cutting measures could cause delays in mail-in voting for the November election.

Susan Gottehrer, of the New York Civil Liberties Union, says the state has taken into account the volume of mail-in ballot expected to COVID-19, and steps will be taken to ensure all ballots are counted.

"If your ballot is not postmarked it can still be accepted the day after the election," she says. "People get concerned about technical glitches so New York also has what's called a notice and cure process, meaning that if somebody doesn't sign a ballot or if there's something technically wrong with a ballot, they will be notified and they will have the opportunity to correct it."

USPS is recommending that voters who are voting by mail send in their ballots at least one week before Election Day.