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President Obama has said there will be "shame" on himself and the American people if pledges to bring in tougher gun safety laws after the Newtown school massacre go unfulfilled.
More than 3,000 gun deaths have occurred in the US since Adam Lanza shot dead 26 children and staff at Sandy Hook Elementary School in Connecticut in December.
More shocking details of the speed of the attack and the arsenal of weapons Lanza owned have been released today.
But, as ITV News Correspondent Geraint Vincent reports from Washington, DC, Mr Obama still faces great difficulty in translating anger at the massacre into legislation aimed at curbing the public's right to bear the most powerful of arms.
Newtown killer Adam Lanza's choice of assault weapons from his store of guns to carry out the December school massacre underlines why tighter controls are needed, Connecticut Governor Dannel Malloy has said.
"We now know that he left the lower capacity magazines at home," Malloy said in a statement after the previously sealed searches of Lanza's car and home were made public.
"This is exactly why we need to ban high capacity magazines and why we need to tighten our assault weapons ban."
The White House has released a four point plan to strengthen gun safety laws.
Titled "President Obama's plan to reduce gun violence and help protect our kids," it reads:
US President Barack Obama has said action must be taken for new gun safety laws in the wake of the Newtown massacre, saying "shame on us if we've forgotten" the pledge made for the school victims.
"We need everybody to remember what we felt less than 100 days ago and make sure what we said wasn't just a bunch of platitudes," Mr Obama said at the White House.
"The entire country was shocked and pledged we'd do something about it and this time it'd be different," he said.
The president said the gun lobby contains "powerful voices" whose "assumption is that people will just forget about" the demand for tighter laws made after the December killings.
But Mr Obama said: "Nothing is more powerful than millions of people calling for change."
The release of the new details surrounding the Newtown massacre and Adam Lanza's vast arsenal of weapons has only inflamed emotional wounds for some in the Connecticut town.
President Obama will today join forces with a group of mothers in demanding "common-sense measures" to protect children from gun violence in the wake of the Newtown massacre.
Mr Obama and Vice President Joe Biden will both appear at the event organised by 'Moms Demand Action for Gun Sense in America' to call on Congress to adopt the new safety laws, the White House said.
Police found a smashed computer hard drive along with the gun safe in the room they believed to be Adam Lanza's bedroom, court papers have revealed.
One person interviewed by the FBI described Lanza as "a shut-in and avid (computer) gamer who plays Call of Duty amongst other games."
FBI agents were also told the Sandy Hook Elementary School was his "life."
Newtown school gunman Adam Lanza had a gun safe in his room and many weapons besides the AR-15-type assault rifle and two handguns used in December's attack.
The court papers, published today, show police inspecting the home Lanza shared with his mother found:
- An Enfield Albian bolt-action rifle
- A Savage Mark II rifle
- A revolver
- Three samurai-style swords with blades measuring up to 71 cm
- A wood handled pole (just over two metres in length) with a blade on one side and a spear on the opposite side
A police search on the car Lanza drove to Sandy Hook Elementary School found:
- A Saiga 12 shotgun
- Two magazines containing 70 rounds of ammunition
Documents released today about the Sandy Hook shootings reveal the items seized by police from the home of gunman Adam Lanza.
Among the items were a card containing a cheque from his mother to buy a firearm, an article from The New York Times about a school shooting at Northern Illinois University and three photographs of what appeared to be a dead person covered with plastic and blood, NBC reports.