He also mocked Vladimir Putin for his alliance with the "gas killing animal" Assad, who was alleged to "enjoy" slaughtering his own people.
Russian Federation is disputing the claim that Assad's government was behind the attack; Trump has said evidence indicates otherwise.
The attack comes nearly a year after a chemical attack in the northern Syrian town of Khan Sheikhoun killed dozens of people.
Vassily Nebenzia said Russian Federation is very concerned with "the risky escalation" of the situation and "aggressive policies" and preparations that some governments are making, a clear reference to the Trump administration and its allies.
Signalling that a US-led military attack is imminent, the president promised that the bombs "will be coming, nice and new and smart".
He said: "Well I think the likely outcome is that action will be taken because it must be taken".
Trump didn't say whether he was referring to a USA military strike.
Russian President Vladimir Putin says the world's current state of affairs is "chaotic" and will only keep exacerbating unless the global community opts for more constructive relations.
The US relationship with Russia is worse than the Cold War era, President Donald Trump said today and blamed special investigator Robert Muellers "fake and corrupt" investigations into the Russian meddling in 2016 election for the "bad blood" between the two countries. Russian Federation needs our help with their economy, and that it would be very easy to do. "Stop the arms race?" - asks the American President. We need all countries to work together.
He claimed that "Democrat loyalists, or people that worked for Obama" are involved in the investigation, and that Mueller himself has conflicts of interest. He was incensed this week by the FBI's raid of his personal attorney's office and hotel room.
"None of them has any confirmation of what the World Health Organization official said", Poznikhir stated, inviting WHO experts to tour the region under security provided by the Russian military. "No Collusion, so they go insane!"
"Final decisions haven't been made", White House Press Secretary Sarah Sanders said.