Swing-state's Supreme Court issues pivotal ruling on mail-in ballots sent without postmark

The Nevada Supreme Court ruled Monday that mail-in ballots without a postmark can be received and counted until four days after the election, the latest in a series of legal setbacks the court has handed to the Republican Party.

Their injunction to reject the ballots was struck down by a lower court earlier this year.

The Nevada high court affirmed the lower court decision in its majority decision Monday, noting that the RNC had failed to demonstrate evidence to support its claims that the non-postmarked ballots were vulnerable to election fraud or favored one political party over another. 

Judges also agreed with the lower court's contention that the RNC lacked proper standing to sue, and that the case was "inherently speculative."

"If a voter properly and timely casts their vote by mailing their ballot before or on the day of the election, and through a post office omission the ballot is not postmarked, it would go against public policy to discount that properly cast vote," the majority of justices wrote in their opinion.

But it comes as Democrats have sought to position themselves as the party that supports free and fair elections, seizing on Republican lawsuits as a means of disenfranchising voters.

Fox News Digital has reached out to the RNC for comment.