He's saying major news corporations (which he called by name) have a damaging story, and are probably waiting for additional verification, leaks, info, action by the President, or the go-ahead from intelligence agencies to release the info.
Seeing that anything damaging to our PRESIDENT would inevitably become a national security issue, or possibly put the county at risk, it's highly feasible that this is true. Reporters did the same vague shyt before the Russia dossiers became verified by the intelligence agencies. I'm sure people were cynical then too.
Are you not yet entertained?