WASHINGTON (AP) President Barack Obama is voicing skepticism about proposals to place armed guards at schools in the aftermath of the mass shooting in Newtown, Conn., that killed 20 first graders.

Recalling the Dec. 14 rampage as the worst day of his presidency, Obama pledged to put his ``full weight'' behind legislation aimed at preventing gun violence.

In his most specific remarks about gun violence since the deadly assault at Sandy Hook Elementary School, Obama says he still supports increased background checks and bans on assault weapons and high capacity bullet magazines.

Obama made his remarks on NBC's ``Meet the Press.''

Six adults also died at the school. Authorities say the shooter killed himself and his mother at their home.