President Barack Obama and Vice President Joe Biden met Thursday with relatives of the victims of the Connecticut school shooting, who were visiting Washington on the eve of the six-month anniversary of the tragedy to push anew for gun control.

Legislation to expand background checks for gun buyers failed in the Senate in April, and there are no indications it has gained any traction over concerns about protecting gun rights. But some of the Sandy Hook victims’ relatives have been making emotional pleas to lawmakers this week and appeared with supportive lawmakers at a Capitol news conference Thursday.