On the eve of the one-month anniversary of the Newtown, Conn., school shooting and days before policy proposals on curbing gun violence are sent to U.S. President Barack Obama, the National Rifle Association says it has enough support in Congress to block a law that would ban assault weapons.

The White House and Democratic lawmakers have vowed to make the ban a reality, and senators plan to introduce a bill that would ban assault weapons and limit the maximum capacity of ammunition magazines.

The ban would target guns like the high-powered Bushmaster AR-15 rifle that was primarily used by the Newtown gunman, Adam Lanza, on Dec. 14. The gun was purchased legally.