As it happened: Joe Biden accepts Democratic nomination for president as Bill Clinton rebukes Trump at DNC

What we know so far

• Joe Biden formally nominated as the Democratic candidate for president.
• Democrats lay out broad critique of availablity of US healthcare and Trump's leadership. 
• Former secretary of state Colin Powell, a Republican, endorses Biden.
• Family of John McCain participates in glowing film about late senator's respect and friendship with Biden.
• Reimagined delegate roll-call with footage of real people from around the country is well-received.