I have seen this regurgitated several times on this site now. This is blatantly false, congress passed a law in 1998 to establish USAID. The EO was made with authority that had been granted by another law.
That law does not allow the President to abolish it:
> Unless abolished pursuant to the reorganization plan submitted under section 6601 of this title, and except as provided in section 6562 of this title, there is within the Executive branch of Government the United States Agency for International Development as an entity described in section 104 of title 5.
- 22 U.S.C. §6563
All it takes is a simple google search.