Turkey

The administration's recent move to endorse a Turkish incursion into Syria sparked outrage among some U.S. Special Forces.

Top brass weren't blindsided by recent events, officials now say.

"We have to always be concerned with this," the former defense secretary said.

"We have reports already of indiscriminate fire landing near American forces," Defense Secretary Mark Esper said.

Turkish officials say the U.S. position was not targeted.

"De-escalate the situation before it becomes irreparable," Pentagon chief spokesman Jonathan Hoffman said.

The stop comes in response to threats from Turkey.

Turkey has begun an invasion of a Syrian region evacuated by U.S. troops.

The Pentagon came out in opposition to Turkey's plan to invade northeastern Syria.

Turkey was barred from the F-35 program after it decided to purchase the Russian S-400 missile.