From the Document: "On October 9, Turkish President Recep Tayyip Erdogan announced the start of 'Operation Peace Spring,' which he stated would target both Kurdish and Islamic State (IS, aka ISIL/ISIS) fighters in northern Syria. Turkey then launched an air and ground assault against Kurdish forces. Turkey's foreign minister has stated that Turkish forces plan to go 18 miles into Syrian territory, and eventually to occupy a corridor along the border. The commander of the Kurdish-led Syrian Democratic Forces (SDF) had stated that the SDF would resist, and fighting has escalated. The launch of the operation followed an October 6 call between President Donald Trump and Erdogan, after which the White House announced that Turkey would 'soon be moving forward with its long-planned operation into Northern Syria,' and that U.S. forces would 'no longer be in the immediate area.' Some Members of Congress then argued that a 'precipitous withdrawal' of U.S. forces would benefit Russia, Iran, the Islamic State, and the Syrian regime."
CRS Insight, IN11179
Congressional Research Service: https://crsreports.congress.gov/