Andrew Napolitano speaks the truth—that friendly intelligence services spy on each others’ citizens and then share the data behind-the-scenes to circumvent legal restrictions.
According to Napolitano’s sources, this is how Obama spied on Trump both before and after the election.
…documents of the FVEY [Five Eyes] have shown that they are intentionally spying on one another’s citizens and sharing the collected information with each other in order to circumvent restrictive domestic regulations on spying. (Source)
The Five Eyes, often abbreviated as FVEY, is an intelligence alliance comprising Australia, Canada, New Zealand, the United Kingdom and the United States. (Same source as above)
More discussion can be found here.