Pablo Martinez Monsivais/AP Photo

As the White House prepares to unveil a sweeping plan aimed at curbing gun violence, the National Rifle Association has launched a preemptive, personal attack on President Obama, calling him an "elitist hypocrite" who, the group claims, is putting American children at risk.

In 35-second video posted online Tuesday night, the NRA criticizes Obama for accepting armed Secret Service protection for his daughters, Sasha and Malia, at their private Washington, D.C., school while questioning the placement of similar security at other schools.

"Are the president's kids more important than yours? Then why is he skeptical about putting armed security in our schools, when his kids are protected by armed guards at their school?" the narrator says.

"Mr. Obama demands the wealthy pay their fair share of taxes, but he's just another elitist hypocrite when it comes to a fair share of security," it continues. "Protection for their kids and gun-free zones for ours."

The immediate family members of U.S. presidents - generally considered potential targets - have long received Secret Service protection.

The ad appeared on a new website for a NRA advocacy campaign - "NRA Stand and Fight" - that the gun-rights group appears poised to launch in response to Obama's package of gun control proposals that will be announced today.

An NRA spokesman said the video is airing on the Sportsman Channel and on the web for now but may appear in other broadcast markets at a later date.

White House spokesman Jay Carney said in a statement that the ad was "repugnant and cowardly."

"Most Americans agree that a president's children should not be used as pawns in a political fight," said Carney. "But to go so far as to make the safety of the President's children the subject of an attack ad is repugnant and cowardly."

In the wake of last month's mass shooting at Sandy Hook Elementary School, the Obama administration has met with a cross-section of advocacy groups on all sides of the gun debate to formulate new policy proposals.

The NRA, which met with Vice President Joe Biden last week, has opposed any new legislative gun restrictions, including expanded background checks and limits on the sale of assault-style weapons, instead calling for armed guards at all American schools.

Obama publicly questioned that approach in an interview with "Meet the Press" earlier this month, saying, "I am skeptical that the only answer is putting more guns in schools. And I think the vast majority of the American people are skeptical that that somehow is going to solve our problem."

Still, the White House has been considering a call for increased funding for police officers at public schools and the proposal could be part of a broader Obama gun policy package.

Fifty-five percent of Americans in the latest ABC News/Washington Post poll say they support adding armed guards at schools across the country.

"The issue is, are there some sensible steps that we can take to make sure that somebody like the individual in Newtown can't walk into a school and gun down a bunch of children in a shockingly rapid fashion. And surely, we can do something about that," Obama said at a news conference on Monday.

"Responsible gun owners, people who have a gun for protection, for hunting, for sportsmanship, they don't have anything to worry about," he said.

ABC News' Arlette Saenz, Mary Bruce and Jay Shaylor contributed reporting.

This post was updated at 9:32 am on Jan. 16 to reflect include comment from an NRA spokesman.