In a statement from his press secretary, President Trump said that Mr. Assad's preparations appeared similar to the ones that Western intelligence officials believe were made by the Syrian government before chemical attacks in April that killed dozens of Syrians, including children.
BREAKING NEWS -White House claims Assad regime is preparing for another chemical weapons attack on Syrian children and civilians.
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Trump ordered the strike on the Shayrat airfield in Syria in April in reaction to what Washington said was a poison gas attack by Assad's government that killed at least 70 people in rebel-held territory.
Spicer warns that "if Assad conducts another mass murder attack using chemical weapons, he and his military will pay a heavy price".
It was the first direct American assault on the Syrian government and Mr Trump's most dramatic military order since becoming president months before.
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The strike was the toughest direct US action yet in Syria's six-year-old civil war, raising the risk of confrontation with Russian Federation and Iran, Assad's two main military backers.
Nikki Haley, the United States Ambassador to the United Nations, Tweeted: "Any further attacks done to the people of Syria will be blamed on Asaad, but also on Russia & Iran who support him killing his own people".
The U.S. military maintains a variety of weapons in the region that could be used in the event of another strike, including manned and unmanned aircraft in several Middle Eastern countries.
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