WASHINGTON (AP) — Braced for a fight, President Barack Obama on Wednesday unveiled the most sweeping proposals for curbing gun violence in two decades, pressing a reluctant Congress to pass universal background checks and bans on military-style assault weapons and high-capacity ammunition magazines like the ones used in the Newtown, Conn., school shooting.

A month after that horrific massacre, Obama also used his presidential powers to enact 23 measures that don't require the backing of lawmakers. The president's executive actions include ordering federal agencies to make more data available for background checks, appointing a director of the Bureau of Alcohol, Tobacco, Firearms and Explosives, and directing the Centers for Disease Control to research gun violence.
But the president, speaking at White House ceremony, acknowledged the most effective actions must be taken by lawmakers.
"To make a real and lasting difference, Congress must act," Obama said. "And Congress must act soon."
Obama vowed to use "whatever weight this office holds" to press lawmakers into action on his $500 million plan. Still, even supportive lawmakers say the president's proposals — most of which are opposed by the powerful National Rifle Association — face long odds on Capitol Hill.
The president was flanked by children who wrote him letters about gun violence in the weeks following the Newtown shooting. Families of those killed in the massacre, as well as survivors of the shooting, were also in the audience, along with law enforcement officers and congressional lawmakers.