An "opening statement" is a speech given at the beginning of a discussion or trial. It is used to briefly introduce the main points or arguments that will be discussed or presented. Full definition
The defense has yet to present any witnesses, but defense lawyers said in opening statements that their clients had no criminal intent. (news.lawreader.com)
The same will happen during opening statements at the hearing. (slaw.ca)
Floor consideration of a measure usually begins with opening statements by the floor managers, and often by other senators. (senate.gov)