President Joe Biden delivered a solemn Oval Office address Wednesday that laid out in the clearest terms yet why he abandoned his reelection campaign.

He wanted to send an unmistakable warning about Republican presidential nominee Donald Trump while anointing Vice President Kamala Harris as his natural successor, without invoking an overtly political tone that would have been out of step in the official setting of the White House. He was determined to show that he would not act like a lame-duck president, outlining an ambitious agenda that underscored his resolve to continue building on his legacy.