At the start of a two-day virtual summit, US President Joe Biden says
upholding democracy is "the challenge of our time".
He wants to promote open society and the upholding of human rights.
China and Russia, who have not been invited to the summit, have reacted angrily.
Nick Harper reports from Washington.
IN: "Over two..."
OUT: SOC
DUR: 52 seconds
POT: 31 / 40 seconds
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