Here's an idea: If you don't encourage an atmosphere of nasty comments, divisiveness, personal attacks, name-calling, and hate coming from the very top, you won't need to be concerned about leaks. That stuff is the media's meat-and-potatoes.
Can you even imagine the media reporting "An undisclosed WH source said today that President Trump quietly donated $1,000 to a DC animal shelter" or "An undisclosed WH source tells CNN that Trump has been sending kitchen staffers out secretly to donate leftover food to the homeless" or "An unnamed staffer reports that Trump and Melania often exchange love notes and hugs during the course of their day"?