Donald Trump has threatened to "obliterate" Turkey's economy if the country does anything he considers to be "off limits" after the withdrawal of US troops from north-east Syria.
The decision to withdraw troops has been criticised by many, including Republicans, as it could lead to a Turkish attack on Kurdish fighters across the border.
Although Kurdish forces had been fighting Islamic State militants in Syria alongside the US, they are considered by Turkey to be terrorists.
Trump tweeted the following threat to Turkey:
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