US election LIVE updates: Joe Biden maintains lead over Donald Trump with Georgia, Nevada, Pennsylvania and North Carolina still too close to call

Summary

• Democrat Joe Biden is pushing closer to the 270 Electoral College votes needed to carry the White House, securing victories in the "blue wall" battlegrounds of Wisconsin and Michigan, and narrowing President Donald Trump's path back to power.
• Trump, with 214 electoral votes, faces a much higher hurdle. To reach 270, he needs to claim all four remaining battlegrounds: Pennsylvania, North Carolina, Georgia and Nevada.
• With millions of votes yet to be tabulated, Biden has already received more than 71 million votes, the most in US history.
• Trump’s campaign has engaged in a flurry of legal activity, requesting a recount in Wisconsin and filing lawsuits in Pennsylvania, Michigan and Georgia.
• Protests have emerged in a number of locations across the US. In Chicago and New York, largely Democrat crowds marched in support of all votes being counted, while in Michigan, Trump supporters protested at a counting centre.