Sending money to aid hunger in Africa would be great.... if hunger alone was the issue/problem in Africa. It's not. It's the root causes of that hunger that needs to be fixed. If you don't fix those, the hunger will go on and on and on ad infinitum and that $300+ million is only a worthless drop in the bucket, especially when most of that money never reaches the actual people starving in the form of food.
Trump needs to address the root causes of that famine in Africa. Most of which are political (See: Venezuela).