Libya: Military Moves Challenge U.S.-Backed Transition Plan [Updated April 8, 2019] [open pdf - 702KB]
From the Document: "On April 4, 2019, Khalifa Haftar, the commander of the Libyan National Army (LNA) coalition that has controlled eastern Libya with foreign military and financial support since 2014, ordered forces loyal to him to begin a unilateral military operation to secure the capital, Tripoli. Tripoli is the seat of the Government of National Accord (GNA), an interim body recognized by the United States and United Nations (U.N.) Security Council as Libya's legitimate governing entity. In response to LNA movements, GNA Prime Minister-designate Fayez al Serraj mobilized pro-GNA forces. Fighting is ongoing near Tripoli, with reports of airstrikes and mobilization by several militia forces."
CRS Insight, IN11091
Congressional Research Service: https://crsreports.congress.gov/