On "Fox News Sunday", Haley said the term "mission accomplished" had different definitions in military and political circles.
"We'll see how smart he is", Haley said. The Western states have accused forces of Syrian President Bashar Assad of an attack with the use of chemical weapons in Duma.
The US president also said the allies goal was "to establish a strong deterrent against the production, spread and use of chemical weapons".
Sheikh Hassan Nasrallah said the US military had kept its strikes limited because it knew a wider attack would spark retaliation from Damascus and its allies and inflame the region. "We all know our work in Syria is not done", she said.
Haley rejected the premise posed by Fox News anchor Chris Wallace that the USA has condoned Assad's use of conventional weapons to kill rebels attacking his forces, just not chemical agents.
United States sources said they had obtained blood and urine samples from victims which had tested positive for chlorine and a nerve agent.
The Syrian Armed Forces later said the USA and its Western allies fired a total of one-hundred-and-ten missiles from manned aircraft and ships.
Pele confident Neymar can lead Brazil to World Cup glory
Brazil and Croatia will meet in Liverpool two weeks before their opening World Cup matches in Russian Federation . He added: 'Everybody knows Brazil have the best individual players in Europe.
Haley also said U.S. Treasury Secretary Steven Mnuchin will announce new sanctions against Russian Federation for its support for Syria's chemical weapons program Monday.
The OPCW itself had declared that the Syrian regime's chemical weapons stockpile had been removed in 2014, only to confirm later that sarin was used in a 2017 attack in the northern town of Khan Sheikhun.
The Syrian Foreign Ministry Saturday condemned what it called "the brutal American-British-French aggression. which constitutes a flagrant violation of worldwide law".
The sanctions are the latest effort by the United States to punish the Assad regime and its allies for a chemical weapons attack that killed dozens of civilians two weeks ago.
Johnson added there was no proposal in place for further attacks, but if Assad's regime were to repeat chemical attacks "clearly, with allies, we would study what the options were".
Russian Federation also decried the US -led operation as a failure, saying the majority of the rockets fired at Syria were intercepted by the Syrian government's air defense systems.
New Western air strikes in Syria would provoke "chaos" in worldwide relations, Russian President Vladimir Putin told his Iranian counterpart on Sunday.