WASHINGTON (Reuters) - U.S. ambassador to the United Nations Nikki Haley said on Tuesday the Trump administration issued a warning to Syria over a possible chemical weapons attack after seeing preparations similar to activities before an attack in April.

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She told a House of Representatives hearing that the administration intended its warning not just to Syria's government but also to Russia and Iran. "I believe that the goal is at this point not just to send (Syrian President Bashar al-)Assad a message but to send Russia and Iran a message that if this happens again we are putting you on notice," Haley said.

(Reporting by Patricia Zengerle in Washington and Michelle Nichols at the United Nations; Editing by Chizu Nomiyama)