His latest policy speech, at a steel plant in Pittsburgh, concentrated on detecting violations of labour standards by trading partners and promises to resort to legal action if necessary.

• 他最近在彼得斯堡的一个钢铁厂的演讲，则关注贸易伙伴对劳动力标准的违反，并且承诺，如果必要的话，会诉诸法律。