In a news conference on Monday afternoon, the Trump administration's press secretary Sean Spicer said: "When you watch babies and children being gassed and suffer under barrel bombs you are instantaneously moved to action".
Iran's President Hassan Rouhani Saturday criticised his U.S. counterpart Donald Trump for the missile attack on the Syrian airbase.
Boris Johnson has pulled out of a visit to Moscow in the wake of the Syrian chemical weapons attack.
The US strikes "aim at slowing the victories of the Syrian army and its allies, and reinforcing terrorist groups", they said in a statement. He said that for that "this oppressive Assad needs to go".
British Foreign Secretary Boris Johnson has cancelled his trip to Moscow following U.S. missile strikes in Syria, which Moscow has denounced.
Secretary of State Rex Tillerson took a more nuanced view, asserting that Assad had undermined his legitimacy as a leader but declaring that defeating Islamic State remains the top US goal in Syria.
Barrie's unemployment rate improves slightly in March
That number seems small on the surface, but average hourly earnings have risen by 68 cents (a gain of 2.7%) from a year ago. They were not counted as unemployed because they had not searched for work during the four weeks that preceded the survey.
The Syrian forces resumed flight operations at the airbase that was hit by the United States on Friday, an opposition group said.
Kaine said that the US should help Syria with humanitarian aid, rather than prioritizing ousting Assad or entering into a war with Syria and possibly its allies.
Washington has long backed rebels fighting Assad in a multi-sided civil war that has killed more than 400,000 people and driven half of Syrians from their homes since 2011.
But the regime has denied any responsibility, saying its air strikes hit a rebel depot containing chemical materials.
Thousands of USA troops are already in Syria and Iraq to help regional forces in the fight to defeat ISIS.
However, "whether Russian Federation was complicit here or whether they were simply incompetent or whether they got outwitted" by the Syrian government, they had "failed in their commitment to the worldwide community", he said.
Amid rising tensions between Moscow and Washington, Johnson said Saturday the situation in war-torn Syria had "fundamentally" changed following a chemical weapons attack on civilians and the USA airstrikes targeting a military airfield.