Photo: The Canadian Press. All rights reserved.

The National Rifle Association executive vice president Wayne LaPierre, gestures during a news conference in response to the Connecticut school shooting on Friday, Dec. 21, 2012 in Washington. The nation's largest gun-rights lobby is calling for armed police officers to be posted in every American school to stop the next killer "waiting in the wings." (AP Photo/ Evan Vucci)

The largest U.S. gun-rights lobbying organization declared its unwavering opposition to any new gun regulations Sunday in the aftermath of the massacre at a Connecticut elementary school, accusing the White House of trying to undermine the constitutional right to bear arms.

Wayne LaPierre, CEO of the influential National Rifle Association, said not a single gun regulation would make children safer. He criticized "a media machine" for blaming the gun industry for each new attack like the one at the Sandy Hook Elementary School in Newtown, Connecticut.

"Look, a gun is a tool. The problem is the criminal," LaPierre said, in a nationally broadcast television interview.

LaPierre hardly backed down from his comments Friday, when the NRA broke its weeklong silence on the Dec. 14 shooting rampage at Sandy Hook that killed 20 students and six adults. The gunman, 20-year-old Adam Lanza, also killed his mother at their home and shot himself as police closed in at the school.

LaPierre's assertion that guns and police officers in all schools are what will stop the next killer drew widespread scorn.

Democratic Rep. Chris Murphy, whose district includes Newtown, called it "the most revolting, tone deaf statement I've ever seen." A headline from the conservative New York Post summarized LaPierre's initial presentation before reporters with the headline: "Gun Nut! NRA loon in bizarre rant over Newtown."

LaPierre told NBC's "Meet the Press" on Sunday that only those armed guards and police would make kids safe.

"If it's crazy to call for putting police and armed security in our schools to protect our children, then call me crazy," LaPierre said. "I think the American people think it's crazy not to do it. It's the one thing that would keep people safe."

He asked Congress for money to put a police officer in every school. He also said the NRA would co-ordinate a national effort to put former military and police officers in schools as volunteer guards.

The NRA leader dismissed efforts to revive an assault weapons ban as a "phoney piece of legislation" that's built on lies. He made clear it was highly unlikely that the NRA could support any new gun regulations.

"You want one more law on top of 20,000 laws, when most of the federal gun laws we don't even enforce?" he said.

LaPierre said another focus in preventing shootings is to lock up violent criminals and get the mentally ill the treatment they need.

"The average guy in the country values his freedom, doesn't believe the fact he can own a gun is part of the problem, and doesn't like the media and all these high-profile politicians blaming him," he said.

Some lawmakers were incredulous, yet acknowledged that the political and fundraising might of the NRA would make President Barack Obama's push for gun restrictions a struggle -- particularly in getting new regulations approved in the Republican-controlled House of Representatives where many lawmakers have close ties to the gun-rights group.

"I have found the statements by the NRA over the last couple of days to be really disheartening, because the statements seem to not reflect any understanding about the slaughter of children" in Newtown, said Sen. Joe Lieberman, a Connecticut independent.

He said the NRA is right in some of the points it makes about the causes of gun violence in America.

"But it's obviously also true that the easy availability of guns, including military style assault weapons, is a contributing factor, and you can't keep that off the table. I had hoped they'd come to the table and say, everything is on the table," Lieberman said.

Obama has said he wants proposals on reducing gun violence that he can take to Congress in January, and after the Connecticut shootings, he called on the NRA to join the effort. The president has asked Congress to reinstate the assault weapons ban that expired in 2004 and pass legislation that would end a provision that allows people to purchase firearms from private parties without a background check. Obama also has indicated that he wants Congress to pursue the possibility of limiting high-capacity magazines.

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Associated Press writers Kevin Freking and Adam Goldman contributed to this report.