What happens if Mitch McConnell is unable to finish his US Senate term?

It was a Capitol Hill mystery. For nearly a month, United States Senator Mitch McConnell was not seen or heard from in public.

Little was known about the 84-year-old’s condition, other than that he was hospitalised on June 14. Conspiracy theories began to bubble online. One prominent right-wing influencer, Laura Loomer, even spread rumours that the Republican leader was brain-dead.

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But after weeks of silence, McConnell confirmed on Sunday that he was on the mend after suffering a fall.

Still, the Kentucky Republican has increasingly appeared frail on Capitol Hill, freezing in front of cameras and walking unsteadily when not in a wheelchair.

Members of Congress are typically on the older side. The average age for a US senator is around 65.

McConnell’s poor health — and the sudden passing of his Senate colleague Lindsey Graham, 71, on Sunday — have reignited the question: What would happen if McConnell were unable to serve the remainder of his term?

The answer is the subject of intense scrutiny, as Republicans seek to preserve their majority in the Senate.

Who is Mitch McConnell?

A seven-term senator from Kentucky, McConnell is the longest-serving party leader in the history of the Senate.

He first entered the Senate in 1985, and in 2007, he became the head of the Republican Party in the chamber, a position he held until 2025.

He continues to serve as a senator, though he is not seeking re-election in November’s midterm elections. His term ends in January.

What is wrong with McConnell’s health?

On Sunday, McConnell said in a statement that a fall on June 14 rendered him “briefly unconscious” and landed him in the hospital. The senator also said he had dealt with a mild case of pneumonia.

But McConnell has long struggled with health and mobility challenges. As a toddler, he survived a severe bout of polio, though it left one of his legs partially paralysed.

McConnell indicated his condition was improving, but that he would not return to the Senate yet.

“With signs of continued progress, I’ve been able to move from hospital care to a rehabilitation center where I’ll keep regaining my strength,” he wrote.

His statement was accompanied by a smiling photo of the senator in a hospital bed, with what appeared to be a copy of Sunday’s Washington Post newspaper.

Senator Mitch McConnell released this photo of himself and his wife, Elaine Chao, on July 12, amid questions about his health [Handout: Office of Senator Mitch McConnell via Reuters]

Has McConnell been hospitalised before?

This is not the first time the senior senator’s health has been a source of concern in recent years.

As recently as February, the veteran lawmaker was hospitalised for flu-like symptoms.

Also, in 2019, McConnell tripped and fell in his Louisville home, fracturing his shoulder.

According to reporting from the Louisville Courier Journal, he also collapsed three times in 2023, suffering a concussion and a broken rib that ultimately led to him using a wheelchair.

It was during that period that McConnell had several instances where he inexplicably appeared to freeze while speaking in public, prompting questions about his fitness to serve.

Why does his presence in the Senate matter?

Republicans have a controlling majority in the Senate — but only by a few seats.

With McConnell absent, the number of Republicans available to vote shrinks from 53 to 52 in the 100-seat Senate.

That could influence the outcome of divisive bills, when every Republican vote matters.

McConnell’s absence has already helped Democrats pass a resolution against President Donald Trump’s war on Iran, with four Republicans crossing party lines to vote for it.

McConnell also sits on the all-important Senate Appropriations Committee, which helps decide discretionary government spending.

The US government has a looming funding deadline on September 30, and McConnell’s continued hospitalisation could muddle efforts to pass funding measures.

Senator Mitch McConnell leans on a colleague’s arm as he walks through the US Capitol on January 15 [Allison Robbert/AP Photo]

What does McConnell’s absence reveal about Republican Party unity?

The Republican majority in the Senate has weakened over time, according to Stephen Voss, a political science professor at the University of Kentucky.

Moderates like Susan Collins and Lisa Murkowski — alongside wild cards like Rand Paul — have shown willingness in the past to join with Democrats during critical votes.

But that small proportion of “swing” Republicans has grown during the midterm primary season.

A number of lame-duck Republicans have lost their re-election bids to party rivals, backed by President Trump. That makes them more willing to buck their party leadership from time to time.

“McConnell’s absence could become inconvenient depending on what sort of policy battles we see in coming months,” said Voss.

What has been the reaction to McConnell’s absence?

News of McConnell’s hospitalisation sent alarm rippling through the US political sphere.

Republican leaders attempted to reassure the public that the senator would soon return to his post. But as the weeks stretched on, questions about McConnell’s condition mounted.

Ultimately, on July 8, Kentucky Governor Andy Beshear sent a letter to McConnell’s office, requesting an update on the senator’s health status.

Beshear has since called McConnell’s written statement on Sunday a “step in the right direction”, but he continues to push for more transparency, suggesting the Republican senator release a video update instead.

Some critics have called on McConnell to step down altogether, questioning his fitness for office. They include Democrat Charles Booker, who is running to succeed McConnell in the midterm elections.

Tres Watson, a Republican strategist and host of the Kentucky Politics Weekly podcast, sees no reason to doubt McConnell’s ability to serve, despite the recent health scares.

“I’ve been around the senator several times in the last year. His brain is functioning fine, his wit is there, his intellect is there, but the body is failing him, and he made the understandable decision not to run for another term,” Watson said.

Kentucky Governor Andy Beshear has pressed Mitch McConnell for a health update [File: Charlie Neibergall/AP Photo]

What happens if Mitch McConnell is unable to serve the rest of his term?

If McConnell were to vacate his senate seat before his term ends, it may be tempting for Democrats to think Beshear, the Democratic governor of Kentucky, could appoint someone from his own party.

That’s not the case, however, because of a recent change in state law. Kentucky is now one of four US states where the governor does not have authority to fill Senate vacancies.

In 2024, Kentucky’s Republican-controlled legislature passed a law requiring Senate vacancies to be filled by a special election, which must be called by the governor.

But experts say holding a special election this year would be fraught with challenges, one of which is timing.

The new law says the governor must give 63 days’ notice before the special election. Senate hopefuls would have to file their candidacy no later than 56 days prior to the vote.

Even if McConnell’s Senate seat were vacated immediately, the earliest a special election could occur is September.

But experts say that cobbling together a special election would not make sense, since November’s midterm elections are barely three and a half months away. McConnell’s Senate seat is up for grabs in that race.

“Setting up the process would take time, so we wouldn’t get a senator in office very quickly, even if this process kicked off soon,” said Voss, the political science professor. “The probability that we’d get a replacement ahead of time is pretty low.”

Watson, the Republican strategist, agrees. He questions the efficiency of rushing to hold a special election, when the midterms are on November 3.

“We’re getting pretty close to Election Day,” Watson said. “They’re not going to put the commonwealth through the expense of having another special election just so someone could be a US senator for effectively one month.”

Representative Andy Barr is running as the Republican nominee to succeed Mitch McConnell in November’s midterm elections [File: Jon Cherry/AP Photo]

Could there be challenges to filling McConnell’s seat?

Yes, a significant challenge could be litigation. Kentucky’s 2024 law is largely untested, and it would almost certainly attract legal challenges.

“I think there’s a decent chance the issue could end up in the courts,” said Joshua Douglas, a University of Kentucky law professor who teaches election law.

Douglas believes there may be a contradiction between the new law and parts of the Kentucky Constitution.

“The 17th Amendment says the legislature may authorise the governor to appoint a temporary replacement, Section 152 of the Kentucky Constitution says the governor appoints one, and the Kentucky legislature now says there must be a special election after the new law,” Douglas said.

Voss explained that the legal challenges could delay any special election to fill McConnell’s seat.

“This is the sort of thing that lawyers know how to tie up in litigation,” Voss said. “There would be people involved who know how to slow walk the process.”

Kentucky Democrat Charles Booker is racing against Republican Andy Barr in November for Mitch McConnell’s open Senate seat [File: Timothy D Easley/AP Photo]

Why can’t the governor pick McConnell’s replacement?

The 2024 law stripped the governor’s authority to select a temporary replacement for a US Senate seat.

Governor Beshear vetoed the bill, but the state legislature, which has a Republican supermajority, overrode his opposition.

The measure is part of a broader strategy of Republican lawmakers to shift powers away from the governor since Beshear’s election in 2019.

“We’ve seen an overall attempt by the Kentucky General Assembly to shift power from the executive to the legislative branch,” Voss said.

But the 2024 law was not the legislature’s first attempt at limiting the governor’s ability to fill Senate vacancies.

Initially, in 2021, Republican lawmakers passed a bill that required the governor to choose a temporary replacement from a list of three provided by the executive committee of the former senator’s party. After filling the vacancy, a special election would be held.

According to Watson, Republicans passed a new version because they were concerned about legal challenges to the 2021 law.

Republicans in the state argue that the 2024 update is more democratic and aligns with the process for filling other vacancies.

Beshear is the only Democrat to hold a statewide office in Kentucky. The state has not elected a Democrat to the US Senate since 1992.

Who is running to replace McConnell in the midterms?

In the general election, Democrat Charles Booker, a former state legislator, is running against Republican Representative Andy Barr to succeed McConnell.