"Could not have had a better result".
And he described the Middle East as a "troubled place".
His choice of words recalled a similar claim associated with President George W. Bush following the U.S. -led invasion of Iraq.
It's the only way to ensure his "America First" agenda is enacted.
The French president has consistently said he'd act, alone if necessary, if Assad crossed the "red line" of using chemical weapons again. The Syrian government has denied the allegations.
In the alleged poison gas attack in Douma on Saturday, pro-opposition rescue workers and doctors tell NPR's Ruth Sherlock that 42 people were killed - the same number as reported by the Britain-based Syrian Observatory for Human Rights.
NATO representatives planned a special session to hear from U.S., British and French officials.
In his next tweet the American president stated that American-Russian relations are currently the worst in history and also suggested Russia should stop the arms race.
Another possibility is that missiles could be launched from US submarines, the locations of which are a tightly guarded secret.
Kremlin spokesman Dmitry Peskov was quoted as saying that care should be taken not to aggravate the situation in Syria.
Last year, the US military formally notified Russia over a hotline shortly before 59 Tomahawk cruise missiles struck the Shayrat air base. When the international body that is ostensibly responsible abrogates its duty, it is morally incumbent on other powers to step up.
But British Prime Minister Theresa May cited reports she said indicated the Syrian government used a barrel bomb - large containers packed with fuel, explosives and scraps of metal - to deliver the chemicals.
Asked about Trump's "Mission Accomplished" assertion, White said it pointed to the successful targeting of three Syrian chemical weapons sites.
"The department does not comment on potential future military actions".
"More than 70 people sheltering in basements have reportedly died, with 43 of those deaths related to symptoms consistent with exposure to highly toxic chemicals", the organization added. She called the Syrian government a "murderous regime". But the description from an ally put things differently.
"Our relationship with Russia is worse now than it has ever been, and that includes the Cold War", Trump said. The second target was a chemical weapons storage facility west of Homs.
Tonight, Russia's Ambassador to the UN, Vassily Nebenzia, urged the US and allies to show restraint and said the "immediate priority is to avert the danger of war".
Assad's Damascus regime, which has long accused Washington of supporting its armed opponents in the country's bloody seven-year-old civil war, hit back at Trump's "reckless escalation".
They have documented 34 chemical weapons attacks in Syria since 2013, including 26 which they attribute to Syrian government forces, the most recent one on the Harasta frontline in eastern Ghouta in Nov 2017. He told the BBC: "He is probably not guilty on this occasion. It is not about regime change". Get ready Russia, because they will be coming, nice and new and "smart!", Mr Trump tweeted.
Both Trump and his defence secretary Jim Mattis abruptly cancelled upcoming travel plans Tuesday, as the USS Donald Cook - a guided-missile destroyer - moved to within striking range of Syria.
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