WASHINGTON — The death of Justice Antonin Scalia has left the Supreme Court with eight members and transformed a presidential election already dominated by questions of executive power, ideology and the future of the country into a direct struggle over the composition of the nation’s highest court. Chief Justice John G. Roberts Jr. announced Scalia’s death in a Court statement, calling the 79-year-old justice an extraordinary jurist and describing his death as a loss to the Court and the country.

Within hours, President Barack Obama said he intends to nominate a successor, while Senate Majority Leader Mitch McConnell said the vacancy should remain open until a new president takes office. Those positions set up a constitutional and political confrontation that could stretch through the remainder of 2016. The Constitution gives the president authority to nominate Supreme Court justices and provides for appointment with the Senate’s advice and consent, but it does not prescribe a timetable for either branch to act.

The vacancy immediately becomes an election issue

Obama, speaking Saturday evening, said in his remarks that he plans to fulfill his constitutional responsibility “in due time” and argued that the Senate should give the eventual nominee a fair hearing and timely vote. The president framed the issue as institutional rather than partisan, emphasizing that the responsibilities involved are larger than any one party.

McConnell took the opposite position almost immediately. In a statement reported Saturday, the Kentucky Republican said the American people should have a voice in selecting the next justice and that the vacancy therefore should not be filled until there is a new president. Senate Minority Leader Harry Reid rejected that position and said the Senate has a responsibility to fill vacancies promptly.

The speed with which the dispute emerged reflects the stakes. Scalia was one of the Court’s most influential conservatives, and his absence creates the possibility of 4-4 decisions in cases that had been expected to produce narrow majorities. An evenly divided Supreme Court can affirm a lower-court judgment without establishing a nationwide precedent, meaning that the consequences of an extended vacancy could be felt case by case across the federal judiciary.

The political calendar makes the dispute still sharper. Republicans control the Senate, 54-46, while Obama has nearly a year remaining in office. The presidential primaries are underway, and candidates in both parties are now effectively campaigning not only for executive authority but also for the power to choose a justice who could serve for decades.

Both sides are invoking constitutional duty

At the center of the argument is Article II’s appointments clause. The constitutional text assigns the president the power to nominate and, with the advice and consent of the Senate, appoint judges of the Supreme Court. Democrats are emphasizing the president’s continuing authority through the end of his term. Republicans are emphasizing the Senate’s separate authority to consent or refuse consent.

Obama reinforced his position Tuesday, saying at a California news conference that there is “more than enough time” for the Senate to consider a nominee. A contemporaneous report quoted the president arguing that there is no unwritten rule barring nominations during an election year. He said he expects to choose someone “indisputably qualified” and indicated that he does not intend to use a recess appointment if the ordinary nomination process can proceed.

Republican senators, meanwhile, are coalescing around McConnell. An Associated Press report published by PBS on Tuesday described vulnerable Republican senators in several states joining the leader’s position that the next president should make the choice. Their argument is political as well as institutional: because voters are already choosing a new president, they say the election itself should help determine the Court’s future direction.

An eight-member Court faces immediate practical questions

Scalia’s absence matters before any nomination is made. The Court is in the middle of a term containing disputes involving abortion, affirmative action, public-sector unions, immigration and the Obama administration’s climate policies. In closely divided cases, a 4-4 split would leave the decision of the lower court in place without producing a binding Supreme Court majority opinion.

That possibility gives both parties additional incentives. For the White House, filling the seat could change outcomes in cases central to the administration’s legacy. For Senate Republicans, delaying a confirmation preserves the possibility that a Republican president could nominate a justice more aligned with Scalia’s jurisprudence. The vacancy is therefore not an abstract argument over procedure; it can affect live litigation and the balance of legal authority across multiple federal circuits.

Scalia’s judicial philosophy also raises the symbolic stakes. Over nearly three decades on the Court, he became the most prominent advocate of originalism and textualism in conservative legal thought. Roberts’s announcement emphasized both Scalia’s intellectual stature and the affection of his colleagues, while Obama’s separate proclamation ordered flags flown at half-staff as a mark of respect.

The nomination fight could reshape the campaign

The presidential contest now has an unusually concrete judicial dimension. Republican candidates can argue that winning the White House is necessary to preserve the Court’s conservative bloc. Democratic candidates can argue that control of the presidency and Senate is necessary to allow a sitting president to exercise an enumerated appointment power. The resulting debate is likely to place judicial nominations, usually an important but secondary campaign issue, near the center of the 2016 race.

There is also a strategic question for Senate Republicans. Refusing to consider any Obama nominee could energize conservative voters, but it could also allow Democrats to campaign against what they will describe as institutional obstruction. A PBS report on Sunday noted that several consequential cases are pending and that the ideological direction of the Court hangs in the balance, helping explain why both parties moved so quickly to define the vacancy on their own terms.

For now, there is no nominee and therefore no confirmation calendar. What is already clear is that Scalia’s death has created two simultaneous vacancies: an empty seat on the Supreme Court and an open question about whether the constitutional appointment process will operate normally in an election year. Obama says he will nominate. McConnell says the Senate should wait. The next stage will begin when the White House names a candidate and senators must decide whether the disagreement remains a statement of principle or becomes an actual refusal to consider a nominee.