President Donald Trump's decision to withdraw all US troops from Syria has been met with strong criticism.
Trump made the announcement on Wednesday, asserting that the Islamic State (IS) group had been defeated.
But major allies, including senior Republicans and foreign powers, have disputed the claim and say the move could lead to a resurgence of IS.
US troops have helped rid much of Syria's north-east of the jihadist group, but pockets of fighters remain.
Republican Senator Lindsey Graham, who is one of Trump's supporters, called the withdrawal decision a "huge Obama-like mistake".
And the UK government pushed back on the president's assurance that IS had now been defeated.
The Pentagon said it was transitioning to the "next phase of the campaign" to eliminate IS but did not provide further details.
President Trump, who has long promised to pull American troops out of Syria, said on Twitter that it was time to bring them home after their "historic victories".
The White House would not give a timescale for the withdrawal but defence officials quoted by the New York Times said President Trump wanted it done within 30 days.
What has the reaction been?
Senator Graham, who sits on the armed services committee, warned that the withdrawal would have "devastating consequences" both in Syria and beyond.
He said that he feared it would mean ceding influence in the region to Russia and Iran.
"An American withdrawal at this time would be a big win for ISIS (IS), Iran, Bashar al-Assad of Syria, and Russia," he said in a statement.
Meanwhile, the UK government distanced itself from President Trump's assertion that IS had now been defeated, reports BBC.
"Much remains to be done and we must not lose sight of the threat they pose," a statement from the Foreign Office said.
Israel said it had been told the US had "other ways to have influence in the area" but would "study the timeline (of the withdrawal), how it will be done and of course the implications for us".
Striking a different tone, Russian foreign ministry spokeswoman Maria Zakharova said the US decision could result in "genuine, real prospects for a political settlement" in Syria.
A spokesman for Kurdish-led authorities in north-eastern Syria, Aldar Xelil, said no-one was yet clear on details of the withdrawal "including US commanders here"
However, the US decision would have an impact on the entire region, he told Ronahi TV.
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