Simon, just a quick googled quote,

"USA's aid, in terms of percentage of their GNP has almost always been lower than any other industrialized nation in the world, though paradoxically since 2000, their dollar amount has been the highest."

Whether or not you are judged by a percentage of GNP, or by amounts, some will criticize that you are not doing enough. Foreign aid is a gift, not a tithe, tho I will admit the gift usually has some strings attached. They always do. I wonder, if you send foreign aid to a dictatorship or socialist country, does the aid actually get to the people, or does it just enrich the leadership. Hmmm, I wonder. Haliburton? Same old rhetoric.

Been there, done that, the washing machine ate the T-shirt