You're missing information relevant to the question. Established as an agency in 98
Congress established USAID in statute, and the president may not unilaterally override a statute by executive order.
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Can the President Dissolve USAID Without An Act of Congress?
No, not lawfully. In 1961, USAID was created by an E.O. issued by President John F. Kennedy (
E.O. 10973), based in part on authority provided in the
Foreign Assistance Act of 1961. But a later
act of Congress (The Foreign Affairs Reform and Restructuring Act of 1998, 22 U.S.C. 6501 et seq.) established USAID as its own agency. In a section titled “Status of AID” (22 U.S.C. 6563) it states:
The key language here is “there is within the Executive branch of Government [USAID]” (see sections 6562/6563). Those are the words Congress uses to establish an agency within the executive branch. It would take an act of Congress to reverse that – simply put, the president may not unilaterally override a statute by executive order.