WASHINGTON - President Barack Obama unveiled Wednesday a $500 million package of executive actions and legislative proposals aimed at reducing gun violence a month after a mass shooting in Connecticut killed 20 elementary school children.

The package includes a call on Congress to ban military-style assault weapons and high-capacity magazine and it would close loopholes in the gun sale background check system.

MORE: Pres. Barack Obama calls for background checks on all gun sales, ban on assault rifles

Obama also is signing 23 executive actions -- which require no congressional approval -- including several aimed at improving access to data for background checks. A presidential memorandum will instruct the Centers for Disease Control to research causes and prevention of gun violence.

In addition, Obama will nominate Todd Jones as director of the Bureau of Alcohol, Tobacco, Firearms and Explosives. Jones currently is the acting director of the agency.

The executive actions are part of an overarching package assembled by a task force led by Vice President Joe Biden.