The US and the UK both criticised the arrests of anti-Beijing movement supporters included Democratic Party founder and barrister Martin Lee, 81, millionaire publishing tycoon Jimmy Lai, 71, and former lawmaker and barrister Margaret Ng, 72.
The governing Democratic Party and a satellite party it created to win proportional representative seats combined to win 180 seats in the 300-seat National Assembly, election officials said with vote-counting nearly complete.
The virus is changing the US as Trump's antagonistic relationship with state governors compromises the nation's fight against the pandemic.
"Joe has the character and the experience to guide us through one of our darkest times and heal us through a long recovery," Barack Obama said in a 12-minute video endorsing Joe Biden's White House bid.
The endorsement came less than a week after Sanders ended his presidential campaign, which was centred around progressive policies such as universal health care.
Among Democrat Joe Biden's possible choices are Senator Kamala Harris and Senator Amy Klobuchar, both former competitors in the battle for this year's Democratic Party nomination.
Despite a hotly contested campaign to challenge US President Donald Trump, Biden and Sanders share common ground on a number of issues.
Only two were given a chance to speak on the topic during the latest debate and neither answer proposed a workable solution.
Democratic candidates attacked Republican US President Donald Trump's handling of the coronavirus outbreak after he held a news conference saying the risk from the virus was "very low."
Voting is under way across Nevada as the most diverse state so far has its say in the Democrats' nomination fight, with leftist firebrand Bernie Sanders leading the race.
The battle to see who challenges Republican President Donald Trump in November has entered an urgent phase, with eight candidates including late entrant Michael Bloomberg, the former mayor of New York, scrambling for advantage.
Bloomberg seemed nervous and hesitant in a rough debut before a national audience in a debate that gave voters their first unscripted look at the media mogul and self-funding former New York mayor
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