WASHINGTON (AP) — Kentucky Gov. Andy Beshear, a rising national figure in the Democratic Party, is calling on the state’s Republican Sen. Mitch McConnell to either prove that he is fit to continue serving after his lengthy hospital stay or resign from office.

Beshear made the demand in a letter after McConnell’s office said Monday that the 84-year-old senator had not yet been medically cleared to leave the rehabilitation facility where he has been undergoing physical therapy. The office said he would miss a major Kentucky political event and upcoming Senate votes. McConnell was hospitalized June 14 and disclosed weeks later that it was the result of a fall.

Beshear, who is widely viewed as a potential presidential candidate in 2028, first urged McConnell in early July to release more information about his condition after weeks of public silence. His letter Tuesday marked a significant escalation.

“I am calling on you to directly and verbally address the people of Kentucky and provide proof of your capacity to serve, or resign,” Beshear wrote to McConnell.

Beshear also sent a letter to Senate Majority Leader John Thune, urging him to investigate McConnell’s condition if the senator does not demonstrate that he is capable of continuing to serve.

McConnell and Thune’s offices did not provide comment on the letter.

McConnell, who led Senate Republicans for nearly two decades, has long guarded his personal life. Since he was hospitalized last month, his office has issued major updates on July 12 and July 27, each accompanied by a single photograph.

But public scrutiny of aging elected officials has intensified after several recent health episodes and deaths in office, including the deaths of California Sen. Dianne Feinstein in 2023 and South Carolina Sen. Lindsey Graham earlier this month, as well as President Joe Biden’s decision not to seek reelection after concerns about his age and health became a dominant political issue.

In the absence of regular public updates from McConnell himself, speculation about his condition has grown online.

“All of this speculation and even this letter could have been avoided with a minimal amount of transparency,” Beshear wrote to Thune.

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Associated Press reporter Mary Clare Jalonick contributed to this report from Washington.

Joey Cappelletti, The Associated Press