I don't know what was shared, the issue is whether it was ours to share. If our ally entrusts us with secret information and we blab about it to some other country which the original ally does not approve of then we hurt our relationship with our ally. They may decide not to share information with us anymore. Does that not make sense?
It does not make sense.
We share US and foreign intelligence information between and among other foreign countries all the time. Once the information is in US possession, a foreign disclosure officer determines the potential parties we can and cannot share it with, and the document is so marked. Some documents have so many caveats, the first page can be nothing but Release to Canada, Mexico, Japan, Russia, China. All other countries NOFORN.
So, since you don't know WHAT was shared, and the leaked report says it was not US intelligence, that leaves you to assume we can't share it. That's not accurate in all cases.
I used to work on the AWACS program. AWAC aircraft were in US, Japan, NATO and Saudi Arabia possession. Imagine the fun I had making sure we were able to include secrets in documents prepared for our ELF-ONE deployed support unit in Riyadh.
Back to Trump ... Everything that's classified is provided with appropriate disclosure caveats. Unless he violated a caveat, he's free by virtue of his position as Commander in Chief and Chief Executive of the nation to release anything he wishes. If the originator of the INTEL was concerned about release to other foreign nations, it would have been so marked.
I don't remember seeing anything in the leaked info on this non-scandal indicating it was released in violation of classification level, foreign disclosure guidance, or originator markings, Do you?