Yet, Trump is doing exactly what he promised to do in his campaign.
U.S. troops will leave under the watch of a new Pentagon chief next month, after Mr James Mattis resigned from the post citing key differences, including on Syria, with the often-impulsive Mr Trump.
"It's more than impossible for Turkey to reach to the remaining IS pocket and fight them".
As for the terrorists of ISIS, says Trump, they are defeated.
In the immediate term, the Kurdish-led Syrian Democratic Council (SDC), which governs over a quarter of war-torn Syrian territory, has to gird for all kinds of catastrophic scenarios, from a barely disguised Turkish invasion to a tightening of Syrian coercive measures. It lives on in thousands of true believers hidden in those countries.
Islamic State launched an attack in Syria's southeast against the US-backed SDF militia, employing auto bombs and dozens of militants.
Others are understandably anxious that the withdrawal will regionally expand the power of the Russians, the Iranians, Hizb Allah, and Assad.
Graham is echoed by Nebraska Sen.
This is the part of Syria where US troops have backed up local fighters in forcing ISIS out of almost all the nearby cities and towns they once held.
But ISIS is a Sunni terrorist organization.
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Several Republicans said leaving Syria was an abandonment of American allies, such as Israel.
Another possibility, however distasteful, is for the Kurds to turn to Bashar al-Assad himself. Any dream they had of greater autonomy inside Syria, or an independent state, is not going to be realized.
In June, the North Atlantic Treaty Organisation allies reached an agreement that would see the YPG ousted from the town but Turkey has complained the roadmap has been delayed and said Turkish forces would enter the town if the United States does not remove the Kurdish militants.
"There will be no need for any constraint in this area where the United States presence was an obstacle before".
Although the civil war in Syria has gone on since 2011, the USA did not begin launching airstrikes against IS until September 2014, and American troops did not go into Syria until 2015. For that, they owe a debt of gratitude to Donald Trump and Recep Tayyip Erdogan.
Turkey will purchase the U.S. Patriot anti-aircraft and missile defense system for $3.5 billion and probably forego the Russian S-400.
Except for a few oddballs and social-media mavens with known sympathies for Islamists, Russia or Syria, the worldwide commentariat has been overwhelmingly critical of the new Trump-Erdogan axis and supportive of the Syrian Kurds.
Meanwhile, witnesses say Turkish forces have started massing on the border of the northern Syrian town of Manbij controlled by USA forces and their Kurdish allies. -Iranian clash in the Gulf, will suffer a severe setback with the US pullout from Syria.
Until Trump finds a permanent Pentagon chief, Shanahan will lead plans for U.S. troops to leave Syria along with a significant drawdown in Afghanistan, both of which critics worry will leave war-torn regions at risk of continued and potentially heightened bloodshed.
Trump on Saturday said that the jihadist group "is largely defeated".
The move is expected to end United States involvement in the war-torn country and allow Turkey to attack the Syrian Kurdish fighters, who were USA allies during the anti-IS war.
Patrick J. Buchanan is the author of "Nixon's White House Wars: The Battles That Made and Broke a President and Divided America Forever".