“We will impose sanctions against Turkey if they invade Syria and advocate suspension of its NATO membership in the event of an attack on Kurdish forces that helped the United States destroy the caliphate of the Islamic state *,” he wrote on Twitter.

Just spoke to Sen @ChrisVanHollen about situation in Syria.

We will introduce bipartisan sanctions against Turkey if they invade Syria and will call for their suspension from NATO if they attack Kurdish forces who assisted the US in the destruction of the ISIS Caliphate.

- Lindsey Graham (@LindseyGrahamSC) October 7, 2019

Earlier in the White House said that the US Armed Forces will not support the Turkish operation in northern Syria.

On October 5, Turkish President Recep Tayyip Erdogan announced that the country could begin a military operation in northern Syria in the coming days.

* “Islamic State” (IG) - the organization was recognized as terrorist by decision of the Supreme Court of the Russian Federation of December 29, 2014.