Donald Trump told Recep Tayyip Erdogan in letter: 'Don't be a tough guy. Don't be a fool!'
In a letter to Mr Erdogan, the US president told the Turkish leader he risked being viewed in history as "the devil".
Thursday 17 October 2019 06:29, UK
Donald Trump warned Turkey's president "don't be a tough guy" in a letter urging him to halt a military offensive in northeast Syria.
The US president told Recep Tayyip Erdogan that he wanted to "work out a good deal" and that the Turkish leader was at risk of being viewed in history as "the devil".
In the letter dated 9 October, Mr Trump wrote: "You don't want to be responsible for slaughtering thousands of people, and I don't want to be responsible for destroying the Turkish economy - and I will."
He added: "I have worked hard to solve some of your problems. Don't let the world down. You can make a great deal.
"History will look upon you favourably if you get this done the right and humane way.
"It will look upon you forever as the devil if good things don't happen.
"Don't be a tough guy. Don't be a fool! I will call you later."
A senior administration official has confirmed to Sky News that the letter is authentic.
Mr Trump is battling to control the political damage following his decision to pull US troops out of northern Syria, clearing the way for the Turkish incursion against the Kurds - America's former allies.
The president has insisted the move was "strategically brilliant" after facing criticism for abandoning Kurdish fighters who helped the US defeat Islamic State militants in the region.
Senior Democrats Nancy Pelosi and Chuck Schumer walked out of a White House briefing on the situation on Wednesday after accusing Mr Trump of throwing insults at them.
Ms Pelosi - who was allegedly called a "third-rate politician" by the president - claimed he appeared visibly "shaken up" after the House of Representatives passed a bipartisan condemnation of his decision to withdraw US troops from northern Syria.
Speaking at the White House on Wednesday, Mr Trump said the Kurds were "not angels" and it might be necessary for Russian-backed Syria and Turkey to "fight it out".
"Our soldiers are not in harm's way - as they shouldn't be, as two countries fight over land that has nothing to do with us," the president said.
"Syria may have some help with Russia, and that's fine. It's a lot of sand.
"So you have Syria and you have Turkey. They're going to argue it out, maybe they're going to fight it out. But our men aren't going to get killed over it."
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A US delegation including Vice President Mike Pence and Secretary of State Mike Pompeo are travelling to Turkey to speak to Mr Erdogan.
But the Turkish president told Sky News he would not receive the US officials, and would only speak to Mr Trump. He later said he would meet the American delegation.
America's hasty exit from Syria has created a land rush between Turkey and Russia - now the undisputed foreign powers in the area - to partition the formerly US-protected Kurdish area.
Hundreds of IS prisoners have escaped during Turkey's military offensive.
Syrian troops accompanied by Russian forces have entered Kobani, a strategically important border city and a potential flashpoint for a wider conflict, according to the UK-based Syrian Observatory for Human Rights, which monitors the Syrian war.