She said she had authorized the British action after intelligence indicated Assad's government was responsible for the attack using chemical weapons in the Damascus suburb of Douma a week ago.
The bombings, hailed by US President Donald Trump as a success but denounced by Damascus and its allies as an act of aggression, marked the biggest intervention by Western countries against Mr Assad and his ally Russian Federation. "Could not have had a better result".
Ann Coulter, another conservative commentator, spent the weekend highlighting angry messages on Twitter from apparent Trump supporters, including one who wrote that while the "the direct damage was some buildings in Damascus; the collateral damage was Trump's political support base".
The attack raised the possibility of retaliation by Russian Federation or Iran, which also provides military support to Assad, threatening in particular to increase the risks facing a force of 2,000 Americans in Syria as part of the battle against the Islamic State. The U.N. Security Council planned to meet later Saturday at Moscow's request.
Haley's comments come days after the USA, in partnership with France and the United Kingdom, launched over 100 missiles at three targets in Syria.
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A Syrian military statement said 110 missiles were fired Saturday by the U.S., Britain and France and that it shot down a lot of them. Since the launch of more than 100 missiles, a war of words has ensued.
Some in the Syrian community believe it was a small positive step in the right direction while others believe it will only cause more problems for the USA and American troops in Syria. Syria has denied the accusation.
Haley said she had spoken to President Trump, who said if the Syrian regime uses "this poison gas" again, the United States is "locked and loaded". North Atlantic Treaty Organisation representatives planned a special session to hear from U.S., British and French officials.
The United States said its strikes were a response to al-Assad's chemical weapons attack that administration officials say employed chlorine and perhaps even sarin, a more deadly nerve agent.
The Russian military claimed Syrian air defense systems had intercepted 71 Western missiles, though the Pentagon flatly dismissed the claim and said all missiles hit their targets.
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"We say enough with death, enough with killing civilians", said Hani Atassi, president of the Syrian American Council chapter in Chicago.
Trump said the mandate for an allied attack was open-ended, but Pentagon chiefs later said the strikes Friday would be repeated only if Assad took further action that warranted a response. The 155th Missile Brigade, which was responsible for launching the sarin-filled rockets used in many attacks, is subordinate to the 4th Armored Division. He criticized the USA and its allies for launching the strike without waiting for worldwide inspectors to visit the area.
"There's various intel, and I won't speak to that", she said. Jaish al-Islam has said it only agreed to the deal because of the Syrian government´s purported use of toxic chemicals on Douma, which medics said killed more than 40 people.
In the days leading up to the US -led airstrike, both Syria and Russian Federation said that reports of the chemical attack were fabricated.
The leader of Lebanon's Hezbollah said on Sunday that Western strikes on Syria had failed to achieve anything, including terrorizing the army, helping insurgents or serving the interests of Israel. "This is hard to do in a situation like this", he said, in light of the volatility of chemical agents.
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Syria and its ally Russian Federation deny any such attack, calling it "fabricated". The Russian government accused the United Kingdom of staging the attack, which the British government says is "ludicrous".