If you’re under surveillance, I’m talking to you, and my half of the conversation isn’t recorded, your half is useless because there’s no context. Hence, the Trump campaign had to be the target of the surveillance, with the other party being included as either a cover or an excuse.
Reasonable people can come to no other conclusion that it was TRUMP who was under surveillance. Once THE RUSSIANS are eliminated as a target, nothing else makes sense other than TRUMP was the target. ILLEGALLY!