Q: In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].
Washington (CNN) The Supreme Court appeared closely divided along ideological lines during oral arguments Monday in a case that could determine President Barack Obama's legacy on immigration. Conservative justices questioned Obama's authority to use executive actions to shield some 4 million undocumented immigrants from deportation. Chief Justice John Roberts and Justice Samuel Alito seemed particularly concerned with language in the administration's guidance that said the program's recipients would be "lawfully present," which they suggested would contradict immigration law. "How is it possible to lawfully work in the United States without lawfully being in the United States?" Alito asked. Roberts added: "I mean, they're lawfully present, and yet, they're present in violation of the law?"Justices divided in challenge to Obama's executive actions on deportationsTexas and other states say the White House overstepped its authority 
 Question:"Our number one purpose of being here is supporting the senators better standing strong on no votes on the new _ justice," he said.
A:
Supreme Court