"The attack took place on Saturday, we know for a fact that it was a chemical weapon", spokeswoman Heather Nauert said.
May and Trump had also "agreed it was vital that the use of chemical weapons did not go unchallenged, and on the need to deter the further use of chemical weapons by the Assad regime".
"What kind of a nation wants to be associated with the mass murder of innocent men, women and children?" But we stand on the right side of this conflict.
"This is not about intervening in a civil war".
The statement made no reference to whether Parliament would be given a say on military action - prompting renewed concerns among opposition parties and some Tory MPs that Mrs May is prepared to go ahead without a Commons vote.
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It's no surprise that those players will have a major role as the Cavaliers try to stave off elimination in just the first round. The Cavs seem to be hitting their stride in their best health all season. "He's hurt us this year".
Trump said that last April's United States missile strike at a desert airbase following an earlier poison gas attack a year ago had not stopped the Syrian regime using chemical weapons. The report said the Syrian air force uses the base to launch strikes on Eastern Ghouta.
Syria's capital has been rocked by loud explosions that lit up the sky with heavy smoke as U.S. President Donald Trump announced airstrikes in retaliation for the country's alleged use of chemical weapons. Estimates of civilian casualties ranged from 21 to more than 78.
US President stated on Twitter that a potential US attack on Syria could happen "soon or not soon at all".
"We will try to make it better", Trump said. Or is it only after six years and numerous chemical attacks (paling in comparison with the death wrought by traditional weapon attacks) that forces the United States to consider action?
A top leader of Jaish al-Islam, a group which controlled Douma for years, told AFP it was Saturday's attack that forced them to accept a Russian-brokered deal and evacuate. Before reports of the latest chemical attack, Trump said the American military would be withdrawing from Syria "very soon", once the defeat of Islamic State militants was secured. Ministry spokesman Maj. Gen. Igor Konashenkov said that images of victims of the purported attack were fakes staged with "Britain's direct involvement", without providing evidence.
The US ambassador to the United Nations, Nikki Haley, said President Donald Trump "has not yet made a decision about possible actions in Syria".
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On Sunday, the day after the attack, the United States president said Russian President Vladimir Putin bore responsibility for the "atrocity" in rebel-held Douma, because of his support for the Syrian government. He has advocated for a more assertive American posture in the region to counter Iran's influence.
Western powers are thought to be preparing for strikes but Russian Federation, a Syrian ally, opposes such action.
Conservative former London mayoral candidate Zac Goldsmith tweeted: "We need a clear response to the Syrian chemical outrage".
Just weeks ago, Trump said he wanted to end US involvement in Syria and bring American troops home to focus on the homeland.
UN Secretary-General Antonio Guterres told an emergency meeting of the UN Security Council called by Russia Friday that "there is no military solution to the conflict".
At the House hearing, Democrats grilled Mattis on the wisdom and legality of Trump ordering an attack on Syria without explicit authorization from Congress. Mattis argued it would be justified as an act of self-defense, with 2,000 US ground troops in Syria; he insisted he could not talk about military plans because an attack "is not yet in the offing".
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It published the unusual allegations in an 8,000-word report on the incident after the Kremlin was accused of using a military grade nerve agent in Salisbury, on March 4.
As part of his "America First" campaign pledge, Trump had promised to remove the USA from costly and prolonged foreign entanglements.