That's what you have been told! π
USAID, as any agency, gets its objectives, program and budget approved by the Presidential administrations and Congress. It is also audited, as any agency, by the OIG.
It doesn't define its objectives by itself. You may disagree with some objectives and programs, but that the objectives and programs approved by Presidential administrations (including Trump) and Congress. There is absolutely no scandal about it.
There's nothing secret about it. Of course, they may not publish each and every detail. Their main programs, calls for applications, etc... are publicised.
How to check it: look on their website. Oh noooo! Musk has blocked it! How convenient as no one can check his claims any more.
If you want to know how it worked, some archives, including annual reports audited by the OIG, are still accessible here. Plenty of facts and data available.
https://2012-2017.usaid.gov/evaluation