Lawmakers have shown little inclination to outlaw assault weapons since a ban on high-capacity firearms expired in 2004, but Biden is hoping to seize on outrage about the regularity of shootings to lead to greater pressure on them to change their mind.

"We did it before," Biden said of the ban at a vigil for victims of gun violence at St. Mark's Episcopal Church in Washington. "We did it, and guess what? It worked ... We can do it again."

The two-hour candlelight vigil, organized by the "Newtown Action Alliance," memorialized the 10th anniversary of the Dec. 14, 2012, Sandy Hook elementary school shooting, when 20 first-grade students and six adults were murdered by a gunman with a semiautomatic rifle in Newtown, Connecticut.

"Guns are now the number one killer of children in America, and we are asked to be brave while hiding under our desks in our classrooms, while too many elected officials lack the courage to pass common-sense laws to save our lives," said Jackie Hegarty, a student who survived the shooting, introducing Biden at the vigil.

Biden has made banning so-called assault weapons a rallying cry for his gun safety agenda after pushing a bipartisan law through Congress in June that includes provisions intended to help states keep guns out of the hands of those deemed to be a danger to themselves or others.

In November, Biden said "I'm going to try to get rid of assault weapons" and that he would "start counting the votes" on whether doing so was possible before the end of the current Congress on Jan. 3.

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