Obama in emotional plea for gun bill vote in Congress
US President Barack Obama appeared to fight back tears as he urged lawmakers to vote on gun control legislation that appears to be stalling in Congress.
Speaking in Connecticut where 26 people died in a December school massacre, Mr Obama said citizens must demand action.
Opinion polls have shown a majority of Americans support a ban on assault weapons and other gun control measures.
But gun rights groups, including the National Rifle Association, have been lobbying politicians against the bill.
"The day Newtown happened was the toughest day of my presidency," Mr Obama said in his speech at Hartford, not far from Newtown, scene of the mass shooting four months ago.
"But I've got to tell you, if we don't respond to this, that'll be a tough day for me too."Worth fighting for?
The Associated Press news agency reports there were tears in Mr Obama's eyes as he described Newtown parent Nicole Hockley, who has said every night she asks her six-year-old son Dylan to come to her in her dreams so she can see him again.
End Quote President Barack Obama
If there's even one thing we can do to prevent a father from having to bury his child, isn't that worth fighting for?”
"If there's even one thing we can do to prevent a father from having to bury his child, isn't that worth fighting for?" Mr Obama asked, amid repeated standing ovations from the crowd.
The Democratic president called for a vote on his three gun legislation priorities - strengthening background checks on gun buyers, limiting the size of ammunition magazines to 10 rounds, and a ban on assault weapons.
But the US Senate recently ditched the proposed ban on assault weapons and on high-capacity magazines, saying there was not enough support for the measure.
On Monday, the president said curbing gun violence was more important than partisan politics.
"Connecticut, this is not about me," Mr Obama said. "This is not about politics.
"This is about doing the right thing for all the families who are here that have been torn apart by gun violence."
Eleven parents of young children who were killed in the Newtown school shooting returned to Washington DC with the president aboard his official plane, Air Force One.
They are due to lobby members of Congress who have not yet backed the gun control bill.'Political stunts'
Mr Obama said: "Nothing's going to be more important in making sure that the Congress moves forward this week than hearing from them."
He criticised Republicans who have threatened to use a procedural tactic known as a filibuster to delay a vote on the gun bill.
Thirteen senators have said in a letter to Senate Majority Leader Harry Reid they would take such action, after Mr Reid brought the bill to the Senate floor for debate on Monday.
"Some back in Washington are already floating the idea that they may use political stunts to prevent votes on any of these reforms. Think about that," said Mr Obama.
"They're not just saying they'll vote 'no' on ideas that almost all Americans support.
"They're saying they'll do everything they can to even prevent any votes on these provisions. They're saying your opinion doesn't matter. And that's not right."
Mr Obama's speech came a week after Connecticut Governor Dannel Malloy signed sweeping gun-control measures into law.
Connecticut follows the states of Colorado and New York in passing tighter state gun laws.