I can’t think of another way to explain the leaks. A day after Kelly assumes office, a story leaks involving Kelly himself. Trump can keep firing people all he wants until he is left with only Ivanka, Jarred and himself in the WH but the leaks will still most likely continue.
Which leads me to think Mohammed Hussein O Barrack in the waning days of his presidency had the WH bugged using the most advanced technology at his disposal. Not hard to imagine since he had the full support of Big Tech. As long as words are spoken inside the WH they will get ‘leaked’ and the president should be aware of that.