Russia, which backs Assad, denied on Wednesday the Syrian president was to blame for the attack, and said it would continue to support him.
The attack Tuesday killed more than 70 people, including more than a dozen children, and left hundreds more suffering from effects of the gas.
A chemical attack in northern Syria, which has played into the hands of anti-Syria governments to start a blame game on Damascus, was a ploy by those who have effectively lost the war to the Syrian government, an analyst has told Press TV.
Syrian chemical weapons attacks continued after the deal.
Standing alongside Jordan's King Abdullah II at a joint news conference, Trump appeared to adopt the first part of Obama's stance - that chemical weapons use is intolerable - while stopping short of saying what might come next. Footage released following the attack also showed the lifeless bodies of almost a dozen children piled onto a wooden cart.
"All the evidence that I have seen points to the responsibility of the Assad regime", said Boris Johnson. "You're now talking about a whole different level".
"The world can not be silent in the face of the horrific massacre in Syria and allow this devastation to repeat itself", Israeli Ambassador to the United Nations Danny Danon said Tuesday. More than 1,400 died in that incident.
It comes as the USA envoy to the United Nations said America could be "compelled to take its own action" in Syria if the world body fails to act.
"We can not close our eyes to those pictures".
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Khaula Sawah, board member and former CEO of the Union of Medical Care and Relief Organizations (OUSSM), said her field team in Idlib had reported that while still unconfirmed, doctors believe - based on the symptoms of the patients - that some form of organophosphate nerve agent was used.
Like Iran, Russia has also questioned whether Mr. Assad's forces were behind the chemical attack, alleging a Syrian airstrike may have hit a chemical weapons storage site set up by the rebels.
"We need action", Cardin said. Trump could also push Moscow to stop Syria's use of chemical weapons, he added.
But officials placed the emphasis on the need for Russian Federation and Iran, Assad backers, to do something.
Speaking in the council, British U.N. Ambassador Matthew Rycroft asked Russia: "What is your plan?"
Okda said that one of the main frustrations among negotiators in Astana had been the absolute lack of an American or Western presence, while "Russia was in the driving seat". They noted that USA presidents have rarely attacked their predecessors so aggressively for events like chemical weapons attacks that Democrats and Republicans both abhor.
The Russian explanation is that a Syrian strike hit an ammunition depot containing chemical weapons run by rebel forces.
Sen. Marco Rubio, R-Florida, went a step further when he said Wednesday that he doesn't think it's a coincidence that a suspected chemical weapons attack in Syria occurred shortly after Tillerson suggested Assad could remain in power.
Locals said the attack began in the early morning, when they heard planes in the sky followed by a series of loud explosions, after which people very quickly began to show symptoms.
Both senators said the attack shows why the United States needs to articulate a clear policy that Assad can't remain in power, both because of US values for human rights and because of national security concerns of causing Syrians to radicalize to fight Assad.