Afghanistan: Issues for Congress and Legislation 2017-2020 [Updated August 19, 2020] [open pdf - 1MB]
From the Summary: "For nearly two decades, Congress has helped shape the U.S. approach to Afghanistan and the ongoing conflict there. This product provides a summary of legislative proposals considered in the 115th and 116th Congresses that relate to U.S. policy in Afghanistan. These address a number of issues, including the following:  The size of, and legal authorization for, the U.S. military presence in the country.  Executive branch transparency and regular reporting requirements.  The purposes for U.S. aid, and conditions under which it can be obligated.  The role of women in Afghan society, government, and the military."
CRS Report for Congress, R45329
Congressional Research Service: https://crsreports.congress.gov/