Brett McGurk
Brett McGurkGilad Kavalerchik

Brett McGurk, the former US special envoy for the global coalition to counter the Islamic State (ISIS), on Sunday claimed that President Donald Trump has "no plan" for what comes next once the American forces are withdrawn from Syria.

McGurk submitted his resignation last month following Trump's surprise decision to pull US forces out of Syria. Speaking Sunday on CBS’ “Face the Nation”, he warned against the consequences of the decision.

"Announcing you’re going to withdraw and without a plan -- and believe me there’s no plan for what’s coming next, right now we do not have a plan -- It increases the vulnerability of our force, it increases the environment on the ground in Syria," charged McGurk.

He suggested that Trump went against the overwhelming advice of his national security team in making his decision.

"In this case, I think the entire national security team had one view, and the president in a conversation with (Turkish) President Erdogan just completely reversed the policy," said McGurk.

"You know the president has said, I think he’s right, you never telegraph a punch when you’re in a military campaign," he added. "You also don’t telegraph your retreat."

McGurk warned the decision would put US forces under additional pressure if they are required to manage a withdrawal and finding a new partner to manage the campaign against ISIS in Syria simultaneously. He expressed skepticism that a country like Turkey would be able to fill that role.

"It takes American leadership and it takes American presence, and we just told the world we're no longer going to be present," he said.

Trump had initially called for a 30-day timeframe to complete the pullout, but after meeting with South Carolina Senator Lindsey Graham, Trump agreed to delay completion of the withdrawal.

Since Trump’s announcement of the withdrawal, concerns have been expressed that Turkey will launch an attack against the US-backed Syrian Democratic Forces (SDF), a militia allied to the US-backed Kurdish YPG which has been fighting the Islamic State (ISIS) jihadist group in Syria.

The US makes a distinction between the YPG and the PKK, but Turkey does not and has more than once expressed its outrage over the American support for YPG, which it views as a terrorist organization.

Last week, Trump threatened to “devastate Turkey economically” if it harms the Kurds after the US withdraws its troops from Syria.

A day later, Trump and Erdogan discussed the creation of a "security zone", the Turkish presidency said in a statement.

Despite the concerns over a potential Turkish attack on the Kurds, Trump argues that Turkey can fill the void left in Syria by America’s departure.

“President Erdogan of Turkey has very strongly informed me that he will eradicate whatever is left of ISIS in Syria....and he is a man who can do it plus, Turkey is right ‘next door.’ Our troops are coming home!” he tweeted in late December.