"At this hour, our democracy is under unprecedented assault, unlike anything we've seen in modern times. An assault on the citadel of liberty: the Capitol itself," Biden said while addressing the nation on Wednesday.
"It borders on sedition, and it must end now. I call on this mob to pull back and allow the work of democracy to go forward," he added, calling on Trump to face the nation and "demand an end to this siege."
"It's not protest; it's insurrection," Biden pointed out.
In a series of tweets, Biden also condemned the actions of pro-Trump protesters, urging the president once again to "defend the Constitution" by "demanding an end to this siege."
Earlier Wednesday, Trump called on his supporters to stay peaceful after they stormed the Capitol Building to protest against the Electoral College certification process.
"Please support our Capitol Police and Law Enforcement. They are truly on the side of our Country. Stay peaceful!" Trump tweeted.
In a video shared on Twitter on Wednesday afternoon, Trump told the protesters to "go home now."
However, despite Trump's call for peace, he has yet to concede to Biden, reaffirming once again on that he would never concede and claiming the election was fraudulent.
Footage and photographs released Wednesday show pro-Trump protesters pushing through barriers along the Capitol perimeter and grappling with officers in full riot gear.
In one photograph shared online, a protester is seen standing on a dais in the Capitol building, and was reportedly yelling "Trump won that election."
In another video shared online, Trump supporters are seen on the House floor rifling through lawmakers’ desks.
According to two people with knowledge of the matter, one person was shot inside the Capitol after protesters breached the building, the Washington Post reported. The female victim is reportedly in critical condition, according to a source who spoke with ABC News.
In addition, DC Mayor Muriel Bowser has issued a citywide curfew from 6 p.m. Wednesday to 6 a.m. Thursday as chaos continues to engulfs the capital. The entire DC National Guard is also expected to be activated within hours, the Post reported.