Definition: 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].
Input: (CNN) -- "Our country has changed," wrote Chief Justice John Roberts on June 25, 2013, when five of the nine Supreme Court Justices dismantled the historic Voting Rights Act. Roberts is correct in at least one respect: Today's Republican Party is no longer the party of Abraham Lincoln, as former Supreme Court Justice John Paul Stevens reminded us again in a recent article in The New York Review of Books. Stevens, a lifelong Republican appointed to the court by Gerald Ford, attacked Roberts and his Republican colleagues for usurping the authority of Congress which had overwhelmingly renewed the act in 2006.Gary May: Roberts court gutting Voting Rights Act, recalls that GOP no longer party of LincolnHe says leading Republican in 1965, Dirksen, was architect of act, rounding up GOP votesLater, Republican "Southern Strategy" wooed white voters, blacks flocked to DemocratsMay: Now court has abetted GOP, as it tries to obstruct voting rights in states 
 Question:He argued that the chief justice's opinion had failed "to explain why such a decision should be made by the members of the _," and not the Congress.

Supreme Court