WASHINGTON, Dec. 14 (Xinhua) -- The U.S. Electoral College cast votes on Monday for a new president based on the 2020 election results, making Democrat Joe Biden's White House 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.

Biden is expected to mark the occasion with an address to the country around 7:30 p.m. ET on Monday.

"Now it is time to turn the page. To unite. To heal," Biden will say, according to an excerpt of his remarks released by his transition team.

"I will work just as hard for those of you who didn't vote for me, as I will for those who did," Biden will say, again vowing to be "a president for all Americans". Enditem