President Trump Donald John TrumpHR McMaster says president's policy to withdraw troops from Afghanistan is 'unwise' Cast of 'Parks and Rec' reunite for virtual town hall to address Wisconsin voters Biden says Trump should step down over coronavirus response MORE on Sunday threatened to "devastate" Turkey's economy if it were to launch an attack on Kurdish fighters in Syria, as his administration prepares to withdraw troops from the war-torn country.

"Starting the long overdue pullout from Syria while hitting the little remaining ISIS [Islamic State in Iraq and Syria] territorial caliphate hard, and from many directions. Will attack again from existing nearby base if it reforms. Will devastate Turkey economically if they hit Kurds," Trump tweeted.

Starting the long overdue pullout from Syria while hitting the little remaining ISIS territorial caliphate hard, and from many directions. Will attack again from existing nearby base if it reforms. Will devastate Turkey economically if they hit Kurds. Create 20 mile safe zone.... — Donald J. Trump (@realDonaldTrump) January 13, 2019

The president also warned Kurdish fighters not to attack Turkey, and called for the establishment of a "safe zone" between Turkey and the U.S.-backed fighters.

ADVERTISEMENT

Trump's tweets came amid ongoing criticism of his decision to pull U.S. forces out of Syria, where they have been assisting Kurdish fighters battling ISIS. The president initially made the announcement on Dec. 19, and the White House said troops would be leaving within 30 days.

The administration later extended the withdrawal timeline to four months. Top officials, including Secretary of State Mike Pompeo Michael (Mike) Richard PompeoHillicon Valley: FBI chief says Russia is trying to interfere in election to undermine Biden | Treasury Dept. sanctions Iranian government-backed hackers Treasury Dept. sanctions Iranian government-backed hackers The Hill's Morning Report - Sponsored by The Air Line Pilots Association - Pence lauds Harris as 'experienced debater'; Trump, Biden diverge over debate prep MORE and national security adviser John Bolton, have been touring the Middle East in recent days in an effort to assuage nervous allies in the region.

Complicating matters is the fact that the U.S.-backed Kurdish militias in Syria are considered by neighboring Turkey to be an extension of the Kurdistan Workers' Party, which Ankara considers a terrorist organization.

Critics of the administration's decision have expressed concern that Turkey will use the U.S. withdrawal as an opportunity to attack the Kurdish fighters. Turkish President Recep Tayyip Erdoğan earlier this month rejected Bolton's calls for the Kurdish fighters to be protected.

Since then, Pompeo has expressed optimism that a deal could be reached to ensure the Kurdish fighters' safety.