Emphatic in his condemnation of the apparent gas attack, Trump noted graphic pictures of the dead and sickened, calling the assault "heinous", "atrocious", "horrible" and "barbaric".
President Donald Trump will no longer travel attend the Summit of the Americas or travel to Peru and Colombia, the White House said Tuesday.
Despite the worldwide revulsion over the chemical weapons attacks, the death toll from such incidents is in the dozens, a fraction of the hundreds of thousands of combatants and civilians killed since an uprising against Assad's rule broke out in March 2011.
But the Russian the ambassador to the U.N., Vassily Nebenzia, said the chemical attack was staged and warned that any USA military response in Syria would have "grave repercussions".
The allegations are also denied by the Syrian government.
The suspected poison gas attack in a Syrian rebel-held town of Douma, just east of Damascus, and Monday's airstrike by US ally Israel have escalated tensions in the already volatile Mideast and raised the threat of possibly imminent American retaliation.
He said the US and its allies want to know why chemical weapons use continues after Russian Federation guaranteed the removal of all such weapons from Syria.
Syrian opposition activists and paramedics said at least 40 people were killed in last weekend's suspected chemical attack and blamed the government.
The OPCW confirmed Monday it planned to send a fact-finding mission to Douma, but declined to reveal a timetable. And we are ready to go into another great war.
"We're going to make a decision tonight or very shortly thereafter", he told reporters.
Vassily Nebenzia said U.S. attacks on Syria "could lead to grave repercussions", during heated UN Security Council exchanges. "Either way, the United States will respond", Haley said.
The White House sharply rejected any suggestion that Trump's own words about pulling USA troops out of Syria had opened the door for the attack, which killed more than 40 people, including children. An escalation to full-tilt US military involvement in Syria would quickly evolve into costly conflict, including possibly with Russian Federation and North Atlantic Treaty Organisation ally Turkey.
"From what we hear now, I am afraid they are looking for a military option, which is very, very risky".
Families were reportedly found suffocated in their homes and shelters, with foam on their mouths.
CNN has not been able to independently verify the authenticity of the images.
The attack comes after a suspected chemical weapons release late on Saturday in Douma, Eastern Ghouta, which killed dozens of people.
A joint United Nations-OPCW investigation determined in 2016 and 2017 that Syrian government forces used chlorine and sarin repeatedly throughout the civil war.
Washington and Paris denied having carried out the strikes and SANA and the Russian army later said Israeli F-15s had fired several missiles at the base from Lebanese airspace.
But Israeli officials said the Tiyas, or T-4, air base was being used by troops from Iran and that Israel would not accept such a presence in Syria of its arch foe.
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