According to The Hill, a federal judge struck down President Biden’s student loan forgiveness program on Thursday, declaring it unlawful.

District Judge Mark Pittman, a Trump appointee, ruled that the program, which would have provided borrowers with up to $20,000 in student loan relief, was “an unconstitutional exercise of Congress’s legislative power.”

The Biden administration has argued that it has the authority to forgive student loans under the Higher Education Relief Opportunities for Students Act of 2003. However, Pittman rejected this argument on Thursday, finding no “clear congressional authorization” for the program.

The ruling comes in response to a lawsuit filed in October by the Job Creators Network Foundation, a conservative advocacy group, on the behalf of one borrower who is ineligible for the relief program and another who is not eligible for the full $20,000.

The group argued that the Department of Education had failed to allow for public notice and comment on the program, depriving their clients of “their procedural rights to protect their concrete interests.”

Thursday’s ruling represents the biggest victory thus far for conservative opponents of the Biden administration’s debt relief program.

Biden’s debt relief program would forgive up to $10,000 in student loans for borrowers who make under $125,000 and up to $20,000 for those who received Pell Grants.