Sens. Chris Van Hollen (D-Md.) and Lindsey Graham (R-S.C.) are threatening sanctions against Turkish President Recep Tayyip Erdoğan unless Ankara forces Syrian opposition fighters into a ceasefire with U.S-backed Kurdish partners in the northeast of the country, as the country roils from the fall of the regime of Syrian President Bashar Assad.

The senators said they are prepared to introduce sanctions legislation this week against Turkey if Ankara does not immediately accept terms for a sustained ceasefire and demilitarized zone.

“While Turkey has some legitimate security concerns that can be addressed, these developments are undermining regional security, and the United States cannot sit idly by,” the senators wrote.

“In the wake of the........

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