A federal appeals court blocked the implementation of the Biden administration's student debt relief plan, which would have lowered monthly payments for millions of borrowers.

In a ruling Thursday, the 8th Circuit Court of Appeals granted a motion for an administrative stay filed by a group of Republican-led states seeking to invalidate the administration's entire student loan forgiveness program. The court's order prohibits the administration from implementing the parts of the SAVE plan that were not already blocked by lower court rulings.

The ruling comes the same day that the Biden administration announced another round of student loan forgiveness, this time totaling $1.2 billion in forgiveness for roughly 35,000 borrowers who are eligible for the Public Service Loan Forgiveness program.

The PSLF program, which provides relief for teachers, nurses, firefighters and other public servants who make 120 qualifying monthly payments, was originally passed in 2007. But for years, borrowers ran into strict rules and servicer errors that prevented them from having their debt canceled. The Biden administration adjusted some of the program’s rules and retroactively gave many borrowers credits toward their required payments.

Two separate legal challenges to Biden's SAVE plan have worked their way through the courts.

In June, federal judges in Kansas and Missouri issued separate rulings that blocked much of the administration's plan to provide a faster path toward loan cancellation and reduce monthly income-based repayment from 10% to 5% of a borrower's discretionary income. Those injunctions did not affect debt that had already been forgiven.

The 10th Circuit Court of Appeals issued a ruling that allowed the department to proceed with the lowered monthly payments. Thursday's order from the 8th circuit blocks all aspects of the SAVE plan.

The Education Department said it was reviewing the ruling.

"Our Administration will continue to aggressively defend the SAVE Plan — which has been helping over 8 million borrowers access lower monthly payments, including 4.5 million borrowers who have had a zero-dollar payment each month," the administration said.