U.S. ambassador to the United Nations Nikki Haley on Sunday said she believed the United States could be hit by a chemical weapons attack similar to the recent attack in Syria if steps are not taken to prevent the possibility.

“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 said during an interview with “Fox News Sunday” host Chris Wallace.

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

Watch Haley's segment below:

Haley’s remarks come just after the U.S., United Kingdom, and France launched joint preemptive airstrikes at three targets in Syria.

According to Secretary of Defense James Mattis and General Joseph Dunford, those targets were locations “specifically associated with the Syrian regime's chemical weapons program.” More specifically, the targets included a “scientific research center,” a “chemical weapons storage facility,” and “an important command post.”

“Important infrastructure was destroyed which will result in a setback for the Syrian regime and lose years of research and development data, specialized equipment and expensive chemical weapons precursors,” Dunford told the press on Friday.

Earlier this month, a chemical weapons attack killed at least 40 people, including women and children, in the Syrian city of Douma.

Syrian President Bashar al-Assad’s regime is thought to be responsible for the attack, though Assad has denied any involvement.