@realcaseyrollins USAID was, as @Phil says, initially established by executive order under JFK to pursue objectives set out in the Foreign Assistance Act of 1961.

but it was formally codified into a Congressionally mandated agency in the Foreign Affairs Reform and Restructuring Act of 1997 congress.gov/bill/105th-congre

what Congress mandates only Congress can undo.

this was less than 10 minutes of Googling. willful ignorance.