The Supreme Court has turned down an effort by the Republican National Committee to end a 30-year-old court order aimed at preventing intimidation of minority voters.

The justices did not comment Monday in rejecting an appeal of lower court decisions that left the order in place at least until 2017.

The order stems from a lawsuit filed by Democrats in New Jersey in 1981 that objected to a "ballot security" program the RNC ran in minority neighborhoods.

Republicans said the order hampers efforts to combat voter fraud, but U.S. District Judge Dickinson Debevoise said voter intimidation remains a threat and preventing it outweighs the potential danger of fraud.

The court action is unrelated to legal challenges to Republican-inspired voter identification laws in the 2012 campaign.