US President-elect Joe Biden delivered a forceful rebuke on Monday to President Donald Trump's attacks on the legitimacy of his victory, hours after winning the state-by-state Electoral College vote that officially determines the US presidency.
California, the most-populous US state, put Biden over the 270 votes needed to win the Electoral College when its 55 electors unanimously cast ballots for him and his running mate, Kamala Harris.
Biden and Harris will be sworn in on January 20.
