U.S. ambassador to the United Nations, Nikki Haley, credited Trump's warning to Syria not to commit another chemical attack for stopping the Assad regime from carrying another one out.

"I can tell you that due the president's actions, we did not see an incident," Haley said at a House Foreign Affairs Committee hearing.

"What we did see before was all the same activity we had seen prior, for the April 4 chemical weapons attacks. And so I think that by the president calling out Assad, I think by us continuing to remind Iran and Russia that while they choose to back Assad, that this was something we were not going to put up with. So I would like to think that the president saved many innocent men, women and children."