US President-elect Joe Biden on Wednesday called on President Donald Trump to act to end the violence in Washington, DC, after protesters stormed Capitol Hill.

Denouncing what he described as an "unprecedented assault" on US democracy, Biden added, “This is an assault on the most sacred of American undertakings -- the doing of the people's business.”

“The scenes we are seeing at the Capitol do not represent who we are, they are a small number of extremists. I call on this mob to pull back and allow the work of democracy to go forward,” continued Biden.

“The words of a president matter. At their best, they can inspire. At worst, they can incite. I call on Trump to go on TV now and defend the Constitution, and demand an end to this siege."

As he left the stage, Biden said, “Enough is enough is enough.”

His remarks came after the Capitol was place on lockdown and the House and Senate went into recess after protesters stormed the Capitol building.

Some senators and congressmen were evacuated, as was Vice President Pence.

The Vice President said earlier he doesn’t believe he has “unilateral authority” to decide between competing slates of electors.

“It is my considered judgment that my oath to support and defend the Constitution constrains me from claiming unilateral authority to determine which electoral votes should be counted and which should not,” Pence said in a statement released just before the joint session of Congress began.