At the same time Erdogan is pushing the U.S. to do his bidding in northwest Syria, he accuses the Trump administration of supporting anti-Turkish PKK/YPK terrorists in northeast Syria. Turkey also continues to insist on buying Russian air defense systems instead of a U.S. produced one.
To halt the Idleb Dawn operations Erdogan shipped new weapon supplies to insurgent groups affiliated with Turkey:
http://www.moonofalabama.org/2018/09/syria-turkish-tantrum-delays-liberation-of-idlib.html