Chemical attack could happen in US 'if we're not smart': Nikki Haley

US Ambassador to the United Nations Nikki Haley on Sunday warned that a chemical attack could take place in the United States as well, if "we are not smart enough."

"This very easily could happen in the United States if we're not smart, and if we're not conscious of what's happening," Haley told Chris Wallace on "Fox News Sunday."

"We have to be very conscious of the fact that we cannot allow even the smallest use of chemical weapons. That's why you saw the president strike this past weekend, that's why you saw him expel sixty Russian spies after the attack in Salisbury," she added.

The US Ambassador to UN also used the occasion to defend the usage of the words "mission accomplished," by the US President Donald Trump after he ordered the military on Friday to launch airstrikes on three sites in Syria.

"The president used the term "mission accomplished" in the military sense. We of course know that our work in Syria is not done," she said.

Dwelling upon the Syrian policy, Haley went on to say, "We're not going to leave until we know we have accomplished those things.Be very clear, if we leave, when we leave, it will be because we know that everything is moving forward."

Her remarks come after, the US, along with the United Kingdom (UK) and France together launched airstrikes against suspected chemical weapons facilities in the war-torn country.

United States President Donald Trump on Friday announced that he ordered precision strikes in Syria in retaliation for Syrian President Bashar al-Assad's chemical attack on Syria's rebel-held town of Douma in Eastern Ghouta on April 7.