The US is creating a "terrorist army" under the guise of border security forces in northern Syria, Turkey's Deputy Prime Minister Bekir Bozdag said on Monday.
"This is not the fight against Daesh and terrorism, but their support," Bozdag wrote on his Twitter page.
According to the coalition, the half of the planned force will be retrained SDF fighters, an alliance of militias in Syria dominated by the Kurdish YPG (People's Protection Units), which Ankara regards as a terrorist group associated with the Kurdistan Workers Party (PKK), banned in the country.
READ MORE: Erdogan Pledges to 'Purge Terrorism' in Kurdish Enclave in Northern Syria
On Sunday, a Turkish senior official told Reuters that it was reason why the US charge d'affaires was summoned in Ankara on Wednesday, as relations between Washington and Ankara remain strained due to US military support for the Kurdish YPG units.