Joe Biden Photo: VCG

The US Electoral College cast votes on Monday for a new president based on the 2020 election results, making Democrat Joe Biden's projected victory official.

The former vice president has surpassed 270 electoral votes needed to clinch the White House after California, which has 55 Electoral College votes, the most of any state, put Biden over the top on Monday evening.

Electors in key battleground states of Pennsylvania, Michigan, Wisconsin, Georgia and Arizona, where Trump had hotly contested but failed, voted with no surprises or defections.