I’m not going to say that Romney didn’t say this. But the only person during the debates that I heard making such a statement was Rick Perry.
Starting at zero, of course, doesn't mean it'll stay at zero. It's just in keeping with the principle of zero-based budgeting, not this baseline insanity we've been stuck with since the 1970s.
"Under President Romney, the U.S. foreign aid budget would shrink. He has said, I will stop sending money to any country that can take care of itself. And no foreign aid will go to countries that oppose American interests.
http://www.rferl.org/content/president-romney-foreign-policy/24598151.html
I also found a bunch of quotes here. I wish he would do it. Just cut it all off immediately and reevaluate.
http://www.citelighter.com/political-science/politics/knowledgecards/romney-foreign-aid