The amendments to section 337 provided the means to prevent infringement proceedings being brought against imported goods in two forums at the same time. A district court hearing an infringement case is required to stay its proceedings, at the request of a respondent in a section 337 proceeding, in respect of any claim that involves the same issues as those pending before the ITC. Such issues would include questions of patent validity, infringement, and any defences that might be raised in both proceedings. The district court may use its discretionary authority to stay any other claims in the case.