The Supreme Court on Friday endorsed a request from Republican campaign groups that want to buy discounted TV advertising for this year’s midterms, the latest in a series of emergency rulings from the high court benefiting the GOP.

The decision effectively upholds guidance issued by the Federal Communications Commission in March that allowed the campaign arms of House and Senate Republicans to pay lower ad rates that were previously reserved only for candidates.

The court’s order will primarily benefit Republicans, who generally raise more money through party committees than Democrats.