The Supreme Court's decision to uphold birthright citizenship has significant implications for immigration policy in the US. Rights groups have praised the ruling, emphasizing its role in preventing the creation of a multigenerational underclass of undocumented individuals. However, Trump's push for a rehearing and legislative changes could reignite debates on immigration and constitutional rights. If successful, such changes could affect hundreds of thousands of children born annually in the US, potentially increasing the undocumented population by millions over the coming decades.