President Barack Obama launched the biggest U.S. gun-control push in generations on Wednesday, urging Congress to approve an assault weapons ban and background checks for all gun buyers to prevent mass shootings like the Newtown school massacre.

Rolling out a wide-ranging plan for executive and legislative action to curb gun violence, Obama set up a fierce clash with the powerful U.S. gun lobby and its supporters in Congress, who will resist what they see as an encroachment on constitutionally protected gun rights.

Obama presented his agenda at a White House event in front of an audience that included relatives of some of the 20 first-graders who were killed along with six adults by a gunman on December 14 at Sandy Hook Elementary School in Newtown, Connecticut.

"We can't put this off any longer," Obama said, vowing to use "whatever weight this office holds" to make his proposals reality. "Congress must act soon," he said, flanked by schoolchildren.

In a sign of how bitter the fight over gun control could get, the National Rifle Association released an advertisement hours before Obama spoke that accused him of hypocrisy for accepting armed Secret Service protection for his daughters. The White House condemned the ad as "repugnant.

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