Historically, last time U.S. tried to enforce secondary sanctions it caused trade disputes and a decade of distrust
We must remember recent history. In 1996, in the absence of any other international support for imposing sanctions on Iran, Congress tried to force the hands of foreign companies, creating secondary sanctions that threatened to penalize them for investing in Iran’s energy sector. The idea was to force international oil companies to choose between doing business with Iran or the United States, with the expectation that all would choose us.
This outraged our foreign partners, particularly the European Union, which threatened retaliatory action and referral to the World Trade Organization and passed its own law prohibiting companies from complying. The largest oil companies of Europe and Asia stayed in Iran until, more than a decade later, we built a global consensus around the threat posed by Iran and put forward a realistic diplomatic means of addressing it.