A key focus since the chemical attack has been on increasing pressure on Russia, Assad's strongest ally, which has used its own military to prop up Assad in Syria.
Criticized for his low-profile diplomacy, Secretary of State Rex Tillerson is emerging from the shadows with a leading public role in shaping and explaining the Trump administration's missile strikes in Syria.
Speaking to The Sun about the USA action, Mr Johnson said: "Crucially - they could do so again".
The meeting was hastily organized after a chemical weapons attack that prompted the U.S.to launch airstrikes against Syria's military.
Foreign ministers from the seven countries said Moscow must change its attitude to Assad if there is to be hope of ending the brutal conflict that has destabilized the Middle East, driven millions to escape Syria and further frayed relations between the West and Russian Federation.
The regional alliance said the USA cruise missile strikes on a Syrian base which Washington said was involved in a chemical attack that killed dozens of civilians would not deter their forces from "liberating" all of Syrian territory. Or they ignore it, and leave the kinds of actions by Assad that will trigger United States intervention radically unclear.
Ministers meeting in the walled Tuscan city of Lucca strongly supported US missile strikes that targeted a Syrian air base believed to have been used to launch the attack.
Despite Russia and Iran's condemnation of Thursday's missile strike, many United States allies have expressed support for the move.
Trump to China: Help on North Korea for a good trade deal
He has also repeatedly hammered China for exporting more goods to the US than it imports. "If China decides to help, that would be great", he said.
The mixed messages have confused and frustrated European allies, who are eager for full US support for a political solution based on a transfer of power in Damascus. The Nazis killed more than 500 civilians in the village in 1944.
Warplanes struck a northern Syrian town Saturday where a chemical attack killed scores of people earlier this week, killing one person and wounding another as Turkey described the US missile attack on an air base as a "cosmetic intervention" unless it removes President Bashar Assad from power. "President Trump evaluated the facts, that the attacks occurred on his watch, and [as he] reflected upon prior responses or lack of responses, he came to the conclusion that we can not yet again turn away, turn a blind eye from what's happened". "We saw this before", Russia's president told reporters. And so what we're trying to do is obviously defeat ISIS. "They are absent from this and are navigating aimlessly in the dark", said a senior European diplomat, who declined to be named.
The G-7 members broadly agree that Assad should go - but not necessarily when, or how.
At UN, Washington's UN ambassador said that Bashar al-Assad can not stay in power after the suspected chemical attack.
It was Thursday afternoon, just hours before 59 US cruise missiles would rain down on a Syrian military airfield in response to what Trump had called "a disgrace to humanity". "Really, now what happens depends on how everyone responds to what happened in Syria and make sure that we start moving toward a political solution and we start finding peace in that area", Haley said. Still, Haley said the USA didn't see a peaceful future for Syria with Assad in power.
Haley noted that ousting Assad was not the US's only priority.
The full interview is set to air Sunday on CNN's "State of the Union", at 9 a.m. EST.
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