On a night that crowned the vice-presidential nominee, the party had choice words for the commander in chief.
The country's top disease expert said he was "very concerned" by the surge in cases across the US.
Senator Elizabeth Warren drops out but says she's not ready to endorse a rival in presidential race.
By Mike Hills
The way Democrats pick a nominee takes months, costs a fortune and doesn't even lead to high turnout.
By Anthony Zurcher
North America reporter