Oh really? They don’t know? EVERY single FBI agent holds a security clearance and is subject to a polygraph on demand. Strap ‘em down, hook ‘em to the box and let’s see who’s lying.
Trump should call each of the 10 highest ranking CIA people in, one by one, one at a time, and ask them for a list of the people who are leaking.
If they do not produce the list, he should say: “Either you do not know what is going on in your agency and are therefore incompetent or you are part of the leaking and cover up.”
“I can not have either in my administration. You are fired.”
Before he got to the end of the top 10 managers, he would get the names of the leakers.