US President Joe Biden.BRENDAN SMIALOWSKI/AFP via Getty Images Nine conservative groups this week filed amicus briefs to the Supreme Court opposing Biden's student-debt relief. One of them argued that all borrowers have an obligation to pay back the loans they borrowed. It comes after advocates and scholars filed over a dozen briefs supporting Biden's plan. In less than a month, the nation's highest court will hear arguments on the legality of President Joe Biden's plan to cancel student debt.