US Supreme Court justices expressed skepticism regarding a Donald Trump executive order that aims to terminate birthright citizenship for children of undocumented immigrants.Donald Trump attended the oral arguments in person, marking the first time a sitting president has participated in such a hearing to support his immigration agenda.A majority of the court defended the 14th Amendment and the 1898 Wong Kim Ark precedent against arguments from the DOJ that citizenship requires legal allegiance.Civil rights groups warned that undermining these long-standing legal protections would destabilize the immigration system and constitutional rights.