"Some want us to send tens of thousands of soldiers to the area and start a new war all over again", Trump said early Thursday on Twitter.
"We stayed and got deeper and deeper into battle with no aim in sight. They must be sanctioned for their attacks on our Kurdish allies".
Ras Al Ain was one of the places from which USA troops withdrew on Monday.
As blood was drawn on both sides of the border, nations around the globe continued to call on Turkey to stand down and seek less aggressive means of resolving their security concerns. He said he expected Turkey to protect civilians and religious minorities and prevent a humanitarian crisis.
In a later report they said that seven members of the pro-Turkish forces had been killed as the SDF retook a village in Tal Abyad region, one of them a Turkish soldier.
Turkey says it is targeting Kurdish fighters, who fought alongside US forces in routing the Islamic State extremist group from northern Syria.
Turkey hit back at Prime Minister Benjamin Netanyahu on Thursday for condemning Ankara's invasion of Syrian Kurdistan, deriding the Israeli premier as a future jailbird.
Trump, however, declared that ISS was defeated "100%" and the USA no longer "has any troops in the area under attack by Turkey, in Syria".
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The insider adds, "You could tell that they were definitely in love and they both looked very happy being around each other". Of course, Thursday night's party wasn't Bella's only birthday celebration.
While the statement warned Turkey against excesses, Trump's failure to intervene, and the breadth of the subsequent attacks, have brought a torrent of bipartisan and global criticism and charges that the United States has abandoned its counterterrorism partners.
"The three countries are finalizing a joint statement that would clearly state our strong condemnation of the Turkish operation", Montchalin told the Foreign Affairs Committee.
"The majority of them - if we allow them today - are ready to go to European destinations", he told reporters in a briefing.
Turkey for its part said it would take responsibility for the IS prisoners it found during its offensive.
USA lawmakers have said Trump gave Erdogan the green light to go into Syria but the official disputed that.
The Ankara-based Anadolu news agency released footage of Turkish armored vehicles crossing the border into northeast Syria late last night, in what was said to be 'the direction of SDF-held territories.' The mobilization prompted local Syrian civilians to flee their towns this morning. "That is what we're looking at right now".
A Kurdish-led group and Syrian activists said that despite the bombardment, Turkish troops had not made much progress on several fronts they had opened.
"Mr. President, your decision regarding Syria is having grave consequences to our national security and that of our allies and partners ..." With Kurdish forces holding nearly the entire northeast end of the Euphrates River, the temptation will be strong to delve much deeper, particularly with rebels hoping to gain more valuable territory bordering the Syrian government.