A Nevada judge has rejected a request by Donald Trump's presidential campaign for an immediate order to be issued in its lawsuit over concerns about voting at a polling place in Las Vegas that remained open late last week.

Judge Gloria Sturman at the Clark County Court said that the order would potentially make public the identities of poll workers, which could put them at risk of harassment.

Most voters are casting their ballots across the United States today in the general election but Nevada and several other states allow early voting.

The Trump campaign has sued the registrar of voters in Clark County, Nevada over a polling place in Las Vegas that had been allowed to remain open late last week to accommodate people who were lined up to vote.

Trump and Democrat Hillary Clinton are in a close contest to win Nevada in today's election after a long and contentious campaign. Nevada is one of several states that permits early voting and Las Vegas is viewed as a base of support for Clinton, a former U.S. Senator from New York and former secretary of state.

Nevada state law says voters who are in line at 8 p.m., when the polls close, must be allowed to cast their ballots.

The lawsuit, filed in a Nevada state court, said election officials violated state law because they allowed people to join the line after 8 p.m. at a polling location at a Latino market.

In the lawsuit Trump asked that the ballots from that polling place be kept separate from other votes, pending any future legal challenges to the results in the state.

David Bossie, Trump's deputy campaign manager, said on MSNBC that the lawsuit was not aimed at suppressing the Hispanic vote.

"This is a lawsuit about the rules of the game," he said.