>Americans have the right to trade with foreign companies

Err, foreign affairs (and thus commerce) has always been something regulated by the US government - something reserved for the president unless the legislative explicitly declares otherwise. Source: https://www.law.cornell.edu/constitution-conan/article-2/sec...

Do you know any constitutional clause or SCOTUS case suggesting otherwise?

There is no right to trade with foreign companies. Try doing business with a North Korean company and see how that goes for you.

Americans have no such right — the US government has the authority to impose economic sanctions on foreign governments that explicitly prohibit doing business with their companies.