Is Trump 'exhausted'? Dems play the age card he used against Biden

Donald Trump's repeated gaffes, non sequiturs and unusual behavior have opened the door to questions from opponents about the 78-year-old Republican presidential nominee's mental and physical fitness.

From bopping to the beat of his music playlist for nearly 40 minutes at a recent swing state town hall to his pro-Vladimir Putin blaming of Ukraine for Russia's invasion, to criticizing former President Abraham Lincoln for not "settling" the Civil War, to riffing on locker room gossip about a pro golfer's anatomy, Trump is providing plenty of fodder for rivals who've declared him "unhinged" and worse.

As Republicans did to 81-year-old President Joe Biden earlier this year, Democrats including horror novelist Stephen King and former presidents Bill Clinton and Barack Obama are seizing every opportunity to bash Trump − and it's a target-rich environment.