The White House on Sunday night said Turkey will soon be launching a military operation in northeastern Syria and that U.S. troops will no longer be "in the immediate area" when it happens.

"Turkey will soon be moving forward with its long-planned operation into Northern Syria. The United States Armed Forces will not support or be involved in the operation, and United States forces, having defeated the ISIS territorial 'Caliphate,' will no longer be in the immediate area," White House press secretary Stephanie Grisham Stephanie GrishamIvana Trump on Melania as first lady: 'She's very quiet, and she really doesn't go to too many places' The Hill's 12:30 Report: Trump uses White House as campaign backdrop Coronavirus tests not required for all Melania Trump speech attendees: report MORE said in a statement.

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The announcement comes hours after President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE held a phone call with Turkish counterpart Recep Tayyip Erdoğan, in which the two reportedly discussed the conflict and agreed to a meeting in Washington in November.

More than 1,000 U.S. troops are currently deployed in northeastern Syria, where they work closely with the Kurdish YPG, which leads the Syrian Democratic Forces in the region. The Kurds have proven to be among Washington's most effective allies in the fight against ISIS.

Erdoğan has repeatedly expressed frustration with Washington's close alliance with the Kurds along his country's border with Syria, linking them to the Kurdistan Workers' Party (PKK), which is designated a terrorist organization in Turkey. Washington also labels the PKK a terrorist group, but not the YPG.

Turkey has pushed for a so-called safe zone that would extend the country's border deeper into Syrian territory. The U.S., in an effort to reduce tensions, has instead been working on establishing a "security mechanism" with its Kurdish allies. But the announcement on Sunday took the SDF by surprise, and the military group released a statement warning of consequences if the U.S. pulls out and allows Turkey to invade.

"But Erdogan's threats are aimed to change the security mechanism into a mechanism of death, displace our people & change the stable & secure region into a zone of conflict and permanent war," the SDF tweeted, warning that a Turkish military invasion could erase gains made against ISIS and make Syria "a permanent conflict area."

Grisham in her Sunday statement added the U.S. will not be holding any more ISIS fighters, and that "Turkey will now be responsible for all ISIS fighters in the area captured over the past two years in the wake of the defeat of the territorial 'Caliphate' by the United States."

U.S European Command tweeted Saturday that Washington was working "to address Turkey’s legitimate security concerns."