NEWTOWN, Conn. – Police Chief Michael Kehoe has a message for the White House: “Ban assault weapons, restrict those magazines that have so many bullets in them, shore up any loopholes in our criminal background checks,” he said in an exclusive interview with NBC News.

As Vice President Joe Biden prepares to present his gun violence proposals to the White House this week, the residents of Newtown — including first responders and some families of the victims — are speaking out on gun policy for the first time.

Few have a more personal connection to the issue than Kehoe: He was one of the first on the scene at the Sandy Hook Elementary School on Dec. 14 after reports came in of a shooting. He says he’s still haunted by flashbacks of what he witnessed when he entered the school from the rear -- the eerie silence in the hallways, the smell of burnt gunpowder and then the bodies of dead children on the floor of the classrooms.

“I was sickened. I was angry,” he said. “It was something I never could have imagined could have happened in any school in Newtown.”

But as a veteran law enforcement officer, what was most striking to Kehoe was that the gunman, 20-year-old Adam Lanza, had heavier firepower than Kehoe and his officers. The police had Glock pistols with 14-round magazines;  Lanza had a Bushmaster assault-style rifle, two handguns and multiple 30-round magazines that allowed him to squeeze off an estimated 150 shots.

Although it’s still not clear if Lanza ever fired at responding officers — Kehoe thinks he took his own life when he heard the police sirens —  the disproportionate balance in firepower bothers him.

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Newtown, Conn., Police Chief Michael Kehoe at a news briefing on Jan. 2.

“We never like to think we’re going to be outgunned in any situation we’re dealing with," he said. “We do a good job of  securing dynamite in our society. … (Assault rifles) are another form of dynamite. … I think they should ban them.”

Kehoe’s comments come as a new grassroots group — called Sandy Hook Promise — is planning a news conference  Monday in which residents of Newtown and some of the victims’ families plan to call for a “national conversation” on gun violence, mental health and school safety. The goal: to prevent “similar tragedies from ever taking place again.”

But there is far from unanimity about what should be done about guns.

Marie-Claude Duytschaever, the grandmother of 6-year-old Noah Pozner, the youngest victim that day, said she, too, wants a ban on assault rifles.

“Noah had the right to go to school safely,” she said. “He had the right to live, to have a job and a normal life. I think that’s more important than to have a gun that can obliterate a whole room in seconds.”

Sandy Hook Promise group will not call for specific gun control measures at Monday’s press conference and a few have expressed concerns that the White House is moving too rapidly with its proposals — and without seeking input from the families of the victims of Newtown.

The national headquarters of the National Shooting Sports Foundation — the trade association and lobbying arm of gun manufacturers — is just down the road from the Sandy Hook Elementary School. Its representatives met with Biden’s task force last week, and this week it will hold its annual SHOT SHOW in Las Vegas, an event at which major gun makers get to exhibit their wares.

The group didn’t respond to requests for comment. But last week it posted this statement on its website: “Semi-automatic firearms are now the most popular type of firearm in America and are used for a wide variety of legitimate sporting purposes, including hunting, small game control, target shooting and personal defense. They should not be banned.”

It is not clear whether Biden will include a ban on assault weapons in the proposals he submits this week. Any effort to ban the rapid-fire rifles in the United States is expected to face tough opposition in Congress.

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The White House, facing fierce criticism from the gun lobby, has delayed approval of a proposed rule that federal law enforcement officials say could help them stanch the flow of U.S. assault rifles and other high-powered weapons to Mexico’s drug cartels.

The proposed rule, announced by Alcohol, Tobacco and Firearms acting director Kenneth Melson on Dec. 20,  would require U.S. firearms dealers in four southwest border states to report multiple sales of long guns, such as semi-automatic assault rifles which are frequently purchased by so-called “straw buyers” for the cartels. Melson had said he expected the proposed “emergency rule” would receive approval in early January 2011.

But the announced deadline date for White House approval, Jan. 5, has come and gone, leaving ATF officials bewildered and keenly disappointed. Some officials had expressed hopes  that President Barack Obama might even address the issue during his State of the Union speech Tuesday night as a positive step the administration was taking to address the issue of gun violence.

Instead, Obama failed to discuss guns in his speech, and now some ATF officials are wondering whether the proposed emergency rule will take effect at all.  One official with knowledge of the issue said the delay may relate to questions raised by critics about ATF's legal authority to issue such a proposed rule on an emergency basis.

“This is hugely demoralizing and embarrassing for ATF,” said one former agency official who has followed the debate over the rule closely, speaking on condition of anonymity.

U.S.: Gun raids show cartels at work in Ariz.

Reid Cherlin, a White House spokesman said the proposed rule is still “under review” by the Office of Management and Budget and declined to offer any guidance on when it might take effect, if at all. An ATF spokesman declined comment.

U.S. law enforcement officials said the need for the rule was dramatically highlighted this week by federal indictments in Arizona alleging that networks of “straw buyers” – many of them working for the Sinoloa Cartel and other Mexican drug trafficking organizations -- had illegally bought hundreds of firearms from U.S. gun stores. Out of 700 firearms allegedly illegally purchased by one network between September 2009 and December 2010, more than 640 were bought at a single gun store, the Lone Wolf Trading Co., in Glendale, Ariz., according to one indictment.  Most of the weapons were AK-47s, purchased in bulk quantities of 20 to 40, often by the same buyer within days of a previous purchase. In each case, the buyers filled out federal firearms affirming they were buying the guns for themselves and underwent standard federal background checks.  In fact, according  to  federal authorities, they were buying the guns in order to smuggle them to Mexico, where many were later recovered from drug cartel operatives.

 ATF officials say the proposed rule would be an invaluable “intelligence” tool that would allow them to at least identify suspicious activity at gun stores along the southwest border. Currently, firearms dealers such as Lone Wolf Trading are required to report to ATF whenever somebody buys two or more handguns within a five day period. But they are not required to file such reports in the case of long guns, such as AK-47s, even though such assault rifles are now the “weapons of choice” for the Mexican cartels, officials say.  In this case, the Lone Wolf gun store “did nothing wrong” by selling the AK-47s in bulk quantities, although from a law enforcement perspective, the multiple purchases "kind of hit you on the smell test,” said one U.S. law enforcement official, also speaking on condition of anonymity. 

The proposed rule has drawn strong e criticism from the National Rifle Association and gun industry groups, which have publicly urged members and supporters to file public comments expressing opposition to the White House Office of Management and Budget. (OMB, an arm of the White House executive office, must sign off on all proposed federal rules.)

Larry Keane, senior vice president of the National Shooting Sports Foundation, which represents the gun industry, said his group believes the proposed rule “won't assist law enforcement” and “will make it harder for firearms dealers to cooperate with ATF.”

“The cartels that are using straw purchasers will simply modify their behavior,” he said. “Instead of sending one purchaser to buy five firearms, they’ll send straw purchasers  to five different stores — or they’ll simply recruit five straw purchasers to buy one gun at a time.”

In addition, Keane said, “If ATF can ask for  this in these four states, they can ask for that nationwide and there’s no piece of information they can’t ask for.” 

The uncertainty about the rule has fueled the disappointment of gun control groups that Obama has failed to take any action to press for tighter gun control measures, even after the recent shooting rampage in Tucson that seriously wounded Rep. Gabrielle Giffords of Arizona. Many gun control advocates, such as New York Mayor Michael Bloomberg, had called on Obama to seize the opportunity to forcefully address the issue Tuesday night, pointing out that the president during the 2008 campaign had backed tougher measures, including reinstatement of the federal assault weapons ban.

Obama’s failure to say anything on the subject drew criticism from Bloomberg and other gun control advocates Wednesday.

“It’s depressing, but not surprising,” said Kristen Rand, legislative director of the Violence Policy Center, a group that advocates for gun control.

Responding to the criticism, White House Press Secretary Robert Gibbs suggested Wednesday that Obama may address the gun issue in the future. 

"I wouldn't rule out that at some point the president talks about the issues surrounding gun violence," Press Secretary Gibbs said aboard Air Force One on the way to an event with Obama in Wisconsin, according to the Washington Post. “I don't have a timetable or, obviously, what he would say."

More reporting by Michael Isikoff