Some pro-gun control groups, including the Brady Campaign, for several years have called for greater funding of the bill, which provides financial incentives for states to provide mental health records to the national background-check system.
The circumstances in the Newtown shooting, however, were different. The gunman has been described as a "deeply troubled" individual, but no diagnosis of mental illness is known at this time. Multiple guns found at the scene were registered to Lanza's mother Nancy, whom he shot before going to the school, according to ABC News.
Still, lawmakers have called for legislation to beef up mental illness screenings. Rep. Ron Barber (D-Ariz.) was wounded in the 2011 mass shooting in Tucson, Arizona that targeted his former boss Rep. Gabrielle Giffords (D-Ariz.) He penned an op-ed in the Arizona Republic Monday, saying that he would renew his effort to pass the Mental Health First Aid Higher Education Act, "which would provide training to help people identify and respond to signs of mental illness and deal with psychiatric crises."