From the Document: "The Department of Defense (DOD, or the Department) has played a prominent role in the Trump Administration's border security strategy because of controversies related to $13.3 billion in defense funding it has sought to use for border barrier construction projects not otherwise authorized by Congress. These defense funds would comprise a complex mix of DOD program savings and unobligated military construction funds from past years ($6.1 billion), as well as a request for new appropriations in FY2020 ($7.2 billion). An additional $2 billion in non-DOD appropriations are often cited as part of the Administration's overall border funding plan. These include $1.375 billion in previously enacted FY2019 Department of Homeland Security (DHS) appropriations, and $601 million in contributions from a Treasury Forfeiture Fund (TFF) that manages seized assets. Altogether, these defense and non-defense funds would total $15.3 billion, of which 87% would be DOD funds."
CRS Report for Congress, R45937
Congressional Research Service: https://crsreports.congress.gov/