...and not from other nations.

It is certainly true that widening the circle of people who know a secret increases the risk of a leak. Perhaps, after having the last Israel info leaked, they decided to minimize the risk of it happening again, but that is just speculation on my part.
Ultimately, it comes down to a matter of trust.
The leaders have far more information tan we do, so then it comes down to whether you trust them.
You presume Trump is always lying, I don't.