COLUMBIA, S.C. — Lindsey Graham’s sister, Darline Graham Nordone, has been named as her late brother’s temporary replacement in the U.S. Senate after his unexpected death over the weekend.

South Carolina Gov. Henry McMaster announced at a news conference at the Statehouse on Monday that Nordone would serve the remaining months on Graham’s current term, which expires in January.

A person familiar with the appointment process but not authorized to speak about it publicly said Nordone would be sworn in Wednesday. She will be the first woman to represent the state in the U.S. Senate.

“It is such an honor,” Nordone said, as dozens of Graham staffers and campaign advisers stood behind her, some with eyes glassy from welling tears. “Lindsey has always been there for me. And now, I will be there for him.”

Graham died on Saturday night at age 71. He never married or had a family of his own, but Nordone was often by her brother’s side for the political touch points of his career, speaking at events and appearing in some of his campaign ads.

After their parents died at a young age, Graham was left to raise his sister, for whom he later became legal guardian. They were very close, and she was there as he filed reelection paperwork earlier this year, along with her children and grandchildren.

“To Lindsey, I miss you more than I can even put into words,” Nordone said, emotion rising in her voice. “But I’m going to do this. I got it.”

Introducing Nordone, McMaster said the two had spoken in “in the wee hours of Sunday morning” after Graham’s death, and he asked her to serve.

“I had wondered what you would say, and I was humbled by your quickness to see the duty that you had to serve,” McMaster said. He added that President Donald Trump “thought it was a great idea” when he later told him of his pick. Trump announced his support for Nardone to fill the seat earlier Monday.

How will a special primary work?

A special election will be held next month to pick a new Republican nominee in the general election for Graham’s seat. He had been seeking a fifth term this year.

The rare open Senate seat has ignited a scramble among South Carolina’s most ambitious conservatives, who have been eager to climb the political ladder.

Republicans just finished a sprawling and bruising contest to figure out their nominee for succeeding McMaster, who is wrapping up his second term. State Attorney General Alan Wilson won the nomination, overcoming a field that included Lt. Gov. Pamela Evette, Rep. Nancy Mace and Ralph Norman — all of whom are now eyeing Graham’s seat following his death over the weekend.

According to South Carolina law, a one-week filing period for a special primary election begins on the second Tuesday after the candidate’s death, or July 21.

The special primary election would be held on the second Tuesday after that filing period closes, or Aug. 11. Any necessary runoff would follow two weeks after that, or Aug. 25.

From that point, the new nominee would have just over two months to campaign for the general election on Nov. 3.

All of this is problematic according to federal law, which requires military and overseas ballots to go out 45 days before any federal election. For the special election primary, that would have been June 27. Federal Election Commission officials didn’t immediately return a message seeking clarity about the process.

How does Graham’s death affect the general election?

No Democrat has won a Senate seat in South Carolina in decades, and Republicans in recent history typically take statewide seats by double digits. When he last ran in 2020, Graham defeated his Democratic opponent, Jaime Harrison, by a 10 percentage point margin.

So while history suggests that Graham was en route to a fifth term, Republicans are carefully surveying the landscape.

Charleston pediatrician Annie Andrews won the Democratic nomination last month and has raised more than $8 million in the race, and she had just under $3 million cash on hand at the end of May, according to federal filings. Graham had taken in $6 million, with just over $4 million on hand.

In a statement Sunday, Andrews called on South Carolinians to join her “in setting partisanship aside and offering gratitude” to Graham for his service.

Harrison, noting that he and Graham “had our share of political disagreements,” wrote on social media that he “always appreciated that even in our fiercest political battles, we could still share a conversation, a laugh, and a mutual respect for South Carolina and the institutions we were both privileged to serve.”

What happens to South Carolina’s Republican clout?

Graham leaves a major void in the Senate, where seniority can determine influence. He served more than two decades in the chamber, positioning himself to lead committees and set the agenda.

Scott, South Carolina’s junior senator, has been in office only since 2012 — short by the state’s standards. Fritz Hollings served for 38 years, and Strom Thurmond was there for 47.

Scott, who co-chaired Graham’s re-election effort, described his former colleague as “irreplaceable.”

“America lost a statesman, but I lost a friend,” he told ABC’s “This Week.”

Associated Press writer Fatima Hussein in Washington contributed to this report. Kinnard reported from Charleston, South Carolina.