The US Supreme Court has allowed California to use a new voting map that favours Democrats, paving the way for the party to gain up to five congressional seats this year.
The unsigned order from the court did not give a reason for the decision.
Californians approved changing the state's voting districts last year in a referendum, with the aim of cancelling gains made by Republicans through a redrawn map in Texas. Each district sends a lawmaker to the US House.
The Republican party is working to hold on to its thin majority in the House in November's midterm elections. Historically, the party of the current president loses House seats during this congressional vote.
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