US President Joe Biden was set to address the nation on Thursday after a stinging election defeat for his Democratic Party at the hands of Republican Donald Trump, whose stunning political comeback has reverberated around the world. Biden, who was replaced in July as the Democrats’ candidate in the race by Vice President Kamala Harris because of concerns about his mental acuity after a stumbling debate with Trump, will speak at 11:00 a.m. (1600 GMT), the White House said. Harris sought on Wednesday to console the voters who had hoped she would become the first woman to win the White House. She…