Administration critics are slamming Secretary of State John Kerry’s globetrotting in recent weeks to drum up investment in Iran with international banking and business leaders, and say Tehran has a responsibility to clean up its financial act in order to attract investment on its own.

Kerry was in London Thursday to meet with heads of some of Europe’s biggest banks in an attempt to reassure them about doing business in Iran. The meeting is a response to Tehran’s complaints that they’re not reaping the financial benefits the U.S. and other world powers promised them in negotiations over the nuclear accord.