From Strategic Competition and Foreign Policy: What is “Political Warfare”? (IF 11127, Mar. 8, 2019): “Political Warfare” is a term that has recently been reinvigorated by scholars of strategy; it describes the synchronized use of any aspect of national power short of overt conventional warfare — such as intelligence assets, alliance building, financial tools, diplomatic relations, to name a few — to achieve state objectives.
See related CRS Report, Information Warfare: Issues for Congress (R45142, Mar. 5, 2018)