He's campaigning for re-election, not giving speeches as part of his job explaining what is going on the the American People in a transparent manner and carrying out his Constitutional duties. What happened to the customary press briefings?
President Trump speaks to reports all of the time, has had multiple press conferences particularly on the WH lawn answering questions when on his way to one place of the next..
Further, he provides a huge amount of information by means of Twitter directly to the American people without going through the media at all.
As far as "press briefings" by his press secretary, President Trump feels those were happening too frequently. But he is communicating with the people in other ways, including public speeches like the Rio Rancho address to the people.