Trump also said the al-Assad regime has established a pattern of chemical weapons use on its innocent civilian population over the previous year and most recently in an attack in Douma Syria just last weekend.
White said the United States and its allies "do not seek conflict in Syria".
Addressing the council, Guterres said: "At this critical juncture, I call on all member states to act consistently with the charter of the United Nations and with global law, including the norms against chemical weapons". He added that Syria had crossed a "red line".
Shortly after the second attack more than 500 patients, majority women and children, showed signs of exposure to a chemical agent and were taken to medical facilities.
Russian President Vladimir Putin stated on Saturday that the strikes had been carried out in violation of norms and principles of the global law.
The strikes significantly limited Assad's ability to produce chemical weapons, Lt. Gen. Kenneth McKenzie, director of the U.S. military's Joint Staff said, adding it would set back the regime's ability to produce such weapons "for years".
He said there were no initial reports of civilian casualties and that all USA and allied aircraft safely returned to their bases.
Moscow called the emergency Council meeting after the US, France and the United Kingdom fired scores of cruise missiles at what they said were chemical weapons facilities in Syria in response to an alleged chemical weapons attack by Damascus last week. "It will restore deterrence against further regime use of chemical weapons, at least temporarily".
Damascus is still permitted to have chlorine for civilian use, although its use as a weapon is banned. Why would he be so stupid as to use poisonous gas, knowing that it would cause a backlash against his government?
The Pentagon said more than 40 Syrian surface-to-air missiles had "no material effect" on the allied strikes, which McKenzie said hit their targets.
The ambassador noted that Russia's role in Syria was not to support al-Assad but to deal a blow to worldwide terrorism. "We're going to get back to our country, where we belong, where we want to be".
The Russian military claimed Syrian air defence systems had intercepted 71 Western missiles, though the Pentagon flatly dismissed the claim and said all missiles hit their targets.
The operation targeted three Syrian chemical weapons facilities - one in the capital of Damascus and two others near Homs, near the border with northern Lebanon.
"They lost a lot of equipment". "And they were the result of the regime and Russia's failure to live up to their worldwide commitments to remove all chemical weapons from Syria".
Investors have had two days to reflect on the strike, so the operation isn't a factor that would prompt traders to sell anymore, said Mohammed Ali Yasin, the chief executive officer of FAB Securities in Abu Dhabi.
Syria disputed even the most basic facts about the assault.
"To succeed in the long run, we need a comprehensive strategy for Syria and the entire region", Republican Senator John McCain said in a statement after the latest strikes.
"It's only one strike". A USA spokeswoman said Friday the allies had "proof".
Before the USA launched its missile attack, worldwide observers with the United Nations group had yet to reach the Damascus suburb of Douma, where the deadly attack took place.
While there appears to be no immediate alternative to the so-called Geneva Process that would lead to a political transition in Syria, several senior USA officials, speaking on condition of anonymity, insisted it has failed and it was time to rethink. "We confined it to the chemical weapons-type targets".
Syria agreed in 2013 to give up its chemical weapons after a nerve gas attack killed hundreds of people in Douma.
Nebenzia also said recent inspections by the UN's Organization for the Prohibition of Chemical Weapons found no "traces of activity that would contravene the chemical weapons convention" at scientific research facilities targeted in the strikes.
The Organization for the Prohibition of Chemical Weapons, the worldwide chemical weapons watchdog, launched an investigation into the alleged chemical strikes on Douma on Saturday. They will collect soil samples and talk to witnesses to try to pin down what occurred.
While Erdogan emphasized the need to deescalate tensions, Putin reiterated that the Western nations had "grossly" breached the UN charter and worldwide law, according to Russian state media TASS.
"This is something we can not accept, the use of chemical weapons on civilians", he said, "and the worldwide community needs to continue to stand extremely strongly as we continue to hold Syria accountable".
Britain and France, along with Germany, have spent months negotiating with the State Department ways to satisfy Trump's insistence on "fixes" to the deal's sunset and verification provisions, and discussing its failure to address Iran's development and testing of ballistic missiles.
"I think (the relationship) has been changing over time", she said.