Vice President Harris will not say whether she is confident President Biden is currently capable of serving as commander in chief amid calls by lawmakers to invoke the 25th Amendment. Biden withdrew from the presidential race on Sunday after his performance at the first presidential debate sparked concerns over his fitness and mental competency. After the sudden announcement, several lawmakers began to question the president’s ability to serve...

Kamala Harris may well be unstoppable as the Democratic nominee – no one has emerged to run against her – but an ugly brawl over defining her will not be so easily won. The vice president has been a nationally known figure for nearly four years, but has never had to operate under the searing scrutiny of a presidential nominee, and with just a month to go before...