Just give the speech. Don't tell the presstitutes what's "likely to be in it". Announce the topic(s), then give the speech. Let them blather afterwards.
At least President Trump doesn’t pass out copies of a speech before he gives it. People who do this allow the media to spend the entire time of the speech preparing their attack articles instead of listening and paying full attention to the speech. A transcript cannot include all the nuances of body language, tone, audience reaction, etc.