A USA attack on Syria would be in a response to a chemical weapons attack on anti-government rebels, one that Trump and other officials blame on leader Bashar Assad. British officials said up to 75 people were killed.
"We are still assessing the intelligence, ourselves and our allies", Mattis said.
Israel's Prime Minister Benjamin Netanyahu official twitter account reported that he spoke by telephone with Russian President Vladimir Putin and reiterated that Israel will not allow Iran to establish a military presence in Syria.
"The situation is tense", Peskov said, adding that Russian Federation was calling for an "unprejudiced and objective investigation before making judgments" on the suspected use of chemical weapons. France is already involved in the US -led coalition created in 2014 to fight the Islamic State group in Syria and Iraq.
"Our strategy remains the same as a year ago", he said.
She said the White House is confident that Syria was responsible for the deaths at Douma.
It seems Trump has made up his mind.
Later Thursday he was noncommittal. It's unclear what policy the Trump administration is pursuing in Syria beyond fighting the Islamic State militants and hoping for a United Nations -brokered end to the civil war.
The escalating war of words follows the UN Security Council's failure this week to pass a resolution outlining steps to investigate the chemical attack.
After the attack, the rebel group holed up in Douma - Jaish al-Islam - finally agreed to withdraw from the town.
He also said that the USA and its allies are still assessing intelligence to secure evidence of the suspected chemical attack. "I wouldn't take anything off the table" in terms of a USA response, he said.
Meanwhile, Syrians are bracing for a possible US attack in retaliation for Saturday's alleged chemical assault in Douma.
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Haley, the US ambassador to the U.N., told an emergency meeting of the Security Council that should the United States and its allies decide to act in Syria, it would be to defend "a bedrock worldwide norm that benefits all nations" - the prohibition of the use of chemical weapons.
Following the chemical attack, the Arleigh Burke-class guided missile destroyers Ross and Porter launched a total of 59 Tomahawk Land Attack Missiles (TLAMs) against a Syrian airfield believed to have been the point or origin for the aircraft that carried out the attack. Initial reports indicated the use of chlorine gas, possibly in addition to the nerve agent Sarin.
U.S. Ambassador to the United Nations Nikki Haley holds photographs of victims during a meeting at the United Nations Security Council on Syria at the United Nations Headquarters in NY.
The Organization for the Prohibition of Chemical Weapons, based in the Netherlands, announced it was sending a fact-finding team to the site of the attack outside Damascus, and it was due to arrive Saturday.
"There must be a debate and vote in the House of Commons ahead of any military action".
The U.S., France and Britain have been in extensive consultations about launching a military strike as early as the end of this week, U.S. officials have said.
Shamanov emphasized that a retaliatory Russian strike could target USA navy ships and aircraft. During one speech, he said, "We must as a nation be more unpredictable".
The Russian military said it had observed movements of USA navy forces in the Gulf.
Many of those positions, Haley noted, were full of civilians, despite Russian Federation and Syria's contention that they were bombing terrorists. "So he needs to take action".
The development would mark a major victory for the Syrian President Bashar Assad as the United States and allies consider punitive military attacks against Syria following the suspected chemical attack that killed 40 people.
Russian lawmakers have warned the United States that Moscow would view an airstrike on Syria as a war crime, saying it could trigger a direct military clash.
In a follow-up tweet, Trump said America's relationship with Russian Federation "is worse now than it has ever been". He can say something tomorrow, that nothing will happen, but it will sound rather unusual.