"The use of chemical weapons, once allowed to spread, is a threat to everybody and if that takes hold and becomes a routine part of fighting, then we are all at risk", said Security Council diplomat, speaking on condition of anonymity.
He claimed USA relations with Russian Federation are now worse than ever before, including during the Cold War. "We need all nations to work together", President Trump Twitted.
"Russia vows to shoot down any and all missiles fired at Syria".
According to The Guardian, the US, UK and France are already making plans for strikes in Syria that are "intended to punish" the Assad regime following a suspected chemical weapons attack on civilians.
Trump also commented on the deteriorating relationship between the USA and Russian Federation.
Mr. Trump called out Putin along with the leadership in Iran for backing Assad, who he referred to as "Animal Assad".
The Syrian regime and the Kremlin both deny responsibility of the chemical attack and have questioned whether the attack even happened, despite footage from Douma with strong evidence suggesting a chemical attack.
Trump did not detail what a strike would look like, or whether these would be United States missiles.
The Syrian government and its allies are in consultation over USA threats of military action and have "options, an adviser to President Bashar al-Assad was quoted as saying in an interview with a Lebanese channel on Wednesday". The president also called Deputy Attorney General Rod Rosenstein, who signed off on Trump's decision to fire FBI Director James Comey previous year, "conflicted".
The 2,000 US troops in Syria advising local forces on defeating Islamic State militants would be vulnerable to missiles, artillery and other attacks, the former official said.
Mr Trump did not specify whether his tweet referred to a USA military strike.