Kamala Harris’ presidential campaign will release a report Saturday detailing her medical history, the first time the vice president has released health information while in office or running for president.

A senior campaign aide did not say what specific information would be in the report, though it will conclude that Harris is physically and mentally fit enough to serve as president. Harris’ advisers see it as an opportunity to contrast her with Donald Trump and push the former president to release more information on his health, especially following two attempted assassinations and as Trump’s rally speeches get longer and more meandering.

Neither Harris nor Trump had previously released medical records during this race. There is a roughly 20-year age difference between Harris, 59, and Trump, who at 78 would be the oldest person to ever assume the presidency.

Health has been a major focus of the 2024 race. President Joe Biden’s first debate performance put his mental acuity under scrutiny and ultimately led to his dropping out of the race.

For decades, it’s been customary for presidential candidates to release medical reports that include their height, weight, daily medications and other relevant information. Trump has also been pressured to release the results of a comprehensive cognitive exam.

Last November, Trump released a letter purportedly from his doctor, who wrote that Trump was in “excellent” overall health and did “exceptional” on cognitive tests. The letter also suggested that Trump, who weighed 244 in 2020, had lost weight.

Not much has been known about Harris’ health except that she contracted COVID in April 2022. Harris has not released medical information as vice president or when she ran for president in 2020.