ANKARA, Turkey -- Turkish Foreign Minister Mevlut Cavusoglu says Turkey will not refrain from military action to protect its borders from what he describes as threats posed by Syrian Kurdish fighters.

The minister spoke on Wednesday, a day after Turkey rejected U.S. national security adviser John Bolton's demands for assurances that Ankara would protect U.S.-allies Kurdish fighters in northeastern Syria before American troops pull out from the region.

Turkey's rebuff amplified a rift between Ankara and Washington and raised new questions about how the United States would protect fighters who are U.S. allies in the war against the Islamic State group.

Turkey regards the Kurdish fighters as terrorists.

Cavusoglu told Turkey's parliamentary foreign affairs committee the U.S. was "struggling to withdraw" from Syria because it was too far engaged with the militia group.