WASHINGTON (AP) — A poll finds that a significant share of U.S. adults doubt the mental capabilities of 81-year-old President Joe Biden and 77-year-old Donald Trump, the former president and current Republican front-runner in what could be a rematch of the 2020 election.

More than 6 in 10 (63%) say they're not very or not at all confident in Biden's mental capability to serve effectively as president, turning his coming State of the Union address into something of a real-time audition for a second term. A similar but slightly smaller share (57%) say that Trump lacks the memory and acuity for t...