Defense Secretary James Mattis, new national security adviser John Bolton, Vice President Mike Pence and USA ambassador to the United Nations Nikki Haley were all involved in the decision to strike Syria, Reuters reports.
"They attacked Syria because we defeated their terrorist agents", said one of the protesters.
Trump warned Assad that the USA was prepared to "sustain" its strikes on the Syrian government, but also said that "America does not seek an indefinite presence in Syria".
Meanwhile, the US Ambassador to the United Nations Nikki Haley said the strikes were carefully planned to minimise civilian casualties.
Trump softens rhetoric on potential Syria strike
UK Prime Minister Theresa May has called her cabinet back from Easter break early for an emergency meeting on Thursday afternoon. Russia, which backs Mr Assad , has softened its initial threats to retaliate against USA ships and bases in event of an attack.
The U.S. argues that the horrific chemical weapons attack in the suburbs of Damascus last Saturday is a burden Russian Federation must bear, as it failed to ensure that the Syrian regime abandoned its chemical weapons, as the Obama-era agreement required.
This attack comes after six days of threats by the Americans and President Donald Trump in particular, that there would be forceful retaliation in response to a chemical weapons attack in Douma on the outskirts of Damascus.
The U.S. president was also said to be upset over perceived Russian inaction over Syria using the weapons. "But Russia's desperate attempts at deflection can not change the facts - a large body of information indicates that the Syrian regime used chemical weapons on Douma".
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"Major combat operations in Iraq have ended", Bush said at the time, standing before a large banner reading "Mission Accomplished".
On Capitol Hill in Washington, however, the strikes ignited a fresh debate over the scope of the war on terror and just how far the Trump Administration can commit US forces to an undeclared war in the Middle East. It urged the Western forces to also strike Assad's conventional weapons.
CGTN's Alaa Ebrahim reports on the strike aftermath from Damascus.
Pentagon: US 'Successfully Hit Every Target' in Syria
The sites were chosen to minimize civilian loss of life and possible release of chemical agents, the Pentagon officials said. Mattis said he was not aware of any USA losses, and added, "Right now we have no additional attacks planned".
Turkey's president, meanwhile, said the airstrikes on Syrian targets were "correct" and showed the Syrian regime that such actions would not go "unanswered". Even supporters of the strike said the decision could be on shaky legal ground because the president's authority under the Authority for Use of Military Force has not been updated since 2001.