Attendees listen as President Joe Biden and Democratic presidential nominee Vice President Kamala Harris speak about the administration's efforts to lower prescription drug costs during an event at Prince George's Community College in Largo, Md., Thursday, Aug. 15, 2024. (AP Photo/Susan Walsh)

Democratic presidential nominee Vice President Kamala Harris, left, and President Joe Biden depart after speaking about the administration's efforts to lower prescription drug costs during an event at Prince George's Community College in Largo, Md., Thursday, Aug. 15, 2024. (AP Photo/Susan Walsh)

FILE - President Joe Biden leaves after speaking about prescription drug costs at the National Institutes of Health in Bethesda, Md., Dec. 14, 2023. (AP Photo/Andrew Harnik, File)

Democratic presidential nominee Vice President Kamala Harris, left, and President Joe Biden depart after speaking about the administration's efforts to lower prescription drug costs during an event at Prince George's Community College in Largo, Md., Thursday, Aug. 15, 2024. (AP Photo/Susan Walsh)

President Joe Biden, left, listens as Democratic presidential nominee Vice President Kamala Harris speaks about the administration's efforts to lower prescription drug costs during an event at Prince George's Community College in Largo, Md., Thursday, Aug. 15, 2024. (AP Photo/Susan Walsh)