Nikki Haley, US envoy to the UN, has said that the country's decision to launch strikes against Syrian air bases was "fully justified", and that it is prepared to take more action but hopes it won't be necessary.
She said that the move was to deter the country from using chemical weapons against its people again, saying: "Bashar al-Assad must never use chemical weapons again. Ever."
Haley also condemned Iran and Russia for their part in Syria, since Russia was "supposed to have removed all the chemical weapons in Syria".
"Every time Assad has crossed the line of human decency, Russia has stood beside him," she said. "The world is waiting for the Russian government to act responsibly in Syria."
Boris Johnson looks "daft" and is in "deep political trouble" after pulling out of a meeting with the Russians, Alex Salmond has said.
The defence secretary condemned Vladimir Putin's Kremlin for its role in Bashar Assad's suspected chemical weapons attack on his own people.
The leading critic of the Trump administration has told ITV News the US and its allies must build on the president's justified airstrikes.