Twenty-five historians have submitted an amicus brief to the Supreme Court in support of Colorado’s decision to bar Donald Trump from the Republican primary ballot. Their filing aims to address legal uncertainties linked to the 14th Amendment, offering historical insights to aid the court’s deliberations. An amicus brief, authored by individuals or organizations not directly party to the case, serves to provide expertise to assist the court in making informed decisions. Several of US historians who filed the brief have testified extensively in civil and voting rights litigation. The Colorado S…