Secretary of State Mike Pompeo is reportedly meeting Israeli Prime Minister Benjamin Netanyahu next week in Brazil to talk about President Donald Trump's controversial decision to pull USA forces out of Syria.
"We are done", Trump told him, CNN reported on Monday.
There have been warnings from Israel and others that Iran is seeking to form a "land bridge" across to the Mediterranean, and some analysts have said that the USA withdrawal could help that effort.
The press conference came after the prime minister met with his USA counterpart Mike Pompeo on Saturday.
Ex-NATO Supreme Allied Commander Wesley Clark questioned Donald Trump's decision to withdraw troops from Syria, floating the idea that Trump was blackmailed by the Turkish president or received a pay-off.
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Turkish President Tayyip Erdogan speaks during an opening ceremony in Istanbul, Turkey , Dec. 23, 2018. US officials said they didn't know if Shanahan would be Trump's nominee to replace Mattis.
The two leaders discussed "ways to continue cooperation between Israel and the United States against Iranian aggression", a statement from Netanyahu's office said.
Trump on Thursday, however, appeared to walk back his claim that ISIS had been totally defeated, and suggested that other countries, including US allies, will have to confront ISIS on their own.
Trump has long bemoaned the amount of money the US spends overseas and complained that other countries don't pay their share.
Heavyweight adviser Mattis - a decorated Marine general who was often referred to as "the last adult in the room" - made clear in his resignation letter that pulling out of Syria crossed the line.
USA officials have justified the decision by saying Islamic State had been defeated.
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"We have asked our partners to take greater responsibility for securing their home region, including contributing large amounts of money for the resources, equipment, and all of the anti-[IS] effort", Trump said in April after ordering military strikes against Syrian government targets.
One day later, McGurk was confirmed to have resigned, in the latest sign of USA senior official's growing objection to Trump's decision to withdraw troops from Syria. But to leave it when you're within a couple of months of doing something that is very important in the fight against ISIS and the president knows that, and we pull - jerk the rug out from under two months in advance, that's hard to understand, ' outgoing Republican Sen.
Syria has been engulfed in a seven-year civil war.
U.S. politicians-including those from his own Republican Party-and worldwide allies fear the withdrawal of the roughly 2,000 USA troops is premature and would further destabilize the already devastated region. The United States also considers the PKK a terrorist organization.
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"I think there's a problem in this system if Brett doesn't understand what the president's cautions and policy preferences are", Ford said. 'In any case, our relationship is with the Kingdom of Saudi Arabia. "In that regard, whether they disingenuously cling to their contrived pretext of violating Syria's sovereignty and entering the fray exclusively to bring the fight to al-Nusra Front, Daesh and al-Qaeda, or concede that they were always in it to engineer what they call regime change, the intervention was by any informed analysis, always a violation of global law", he stated.