US election 2020 live results: Counting continues in Pennsylvania, Arizona, Georgia

Donald Trump has taken to social media in the middle of the night to again attack the electoral process as the torturous vote count drags on. 

Welcome back to our coverage of the US election.

A defiant Donald Trump has unleashed on Twitter in the middle of the night US time, with a string of tweets slamming the electoral system.

"I easily WIN the Presidency of the United States with LEGAL VOTES CAST. The OBSERVERS were not allowed, in any way, shape, or form, to do their job and therefore, votes accepted during this period must be determined to be ILLEGAL VOTES. U.S. Supreme Court should decide!" he posted.

It came after three days of vote counting leaving Americans still guessing about who their next commander in chief will be. The situation hinges on five swing states. Here's the situation in each.

Joe Biden is rapidly catching up to Donald Trump in Pennsylvania, which comes with an invaluable haul of 20 electoral votes. 

Georgia, which hasn't voted for a Democrat since 1992, has just turned blue, although there are still votes to be counted.

Mr Trump can feel a teensy bit better about North Carolina, where he leads by tens of thousands of votes without many left to count. Unfortunately, due to the state's generous deadline for accepting late-arriving ballots, we are unlikely to have a final result there for some days yet.

Nevada finally reported a new batch of results, and Mr Biden looks to be the clear favourite there now.

Finally, we have Arizona. This is an interesting one. Two highly respected news organisations, Fox News and The Associated Press, actually called Arizona for Mr Biden on election night. That's why some official tallies, including ours, have him just six electoral votes short of victory. His lead has been narrowing, though, and there has been an ongoing fight between the Fox News Decision Desk, which makes the network's calls, and the Trump campaign, which insists the President will end up winning the state. The Decision Desk isn't budging.

Suffice to say, we're still keeping an eye on Arizona. So are increasingly anxious Democrats. You could see those nerves on MSNBC late last night, as left-leaning host Rachel Maddow learned of the state's latest vote totals.

Our live coverage has ended for the day, here's how it unfolded.