The US Congress has certified 270 electoral college votes for Biden needed to secure victory over Trump.
Biden’s victory is sealed as Congress's electoral count passed the 270-mark at 3:32 a.m.
Vermont put him over the top.
US lawmakers reconvened on Wednesday evening to certify Joe Biden's election victory, after the session was interrupted earlier in the day by rioters who stormed the Capitol building.
Vice President Mike Pence began the session and said, "To those who wreaked havoc on our capitol today you did not win, violence never wins. Freedom wins and this is still the people's house."
“As we reconvene in this chamber, the world will again witness the resilience and strength of our democracy, for even in the wake of unprecedented violence and vandalism at this Capitol, the elected representatives of the people of the United States have assembled again on the very same day to support and defend the Constitution of the United States,” Pence continued.
Senator Mitt Romney (R-UT) excoriated Trump during his speech.
"We gather due to a selfish man's injured pride. And the outrage of supporters who he has deliberately misinformed for the past two months - and stirred to action this very morning. What happened...was an insurrection, incited by the President of the United States," he said.
"Those who choose to continue to support his dangerous gambit by objecting to the results of a legitimate democratic election, will forever be seen as being complicit in an unprecedented attack against our democracy," he added.
"The best way we can show respect for the voters who are upset is by telling them the truth. That's the burden - that's the duty of leadership."
Senator Lindsey Graham (R-SC) said in his speech, "Count me out. Enough is enough ... Joe Biden and Kamala Harris are lawfully elected and will become president and vice president of the United States on Jan. 20."
During the session, the Senate voted 93-6 to reject a challenge to Arizona's electoral votes for Biden.
Later, the House also voted 303-121 to reject the Republican effort to block counting Arizona’s electoral votes for Joe Biden.
121 House Republicans voted in support of the effort, 83 voted against.