> Not at all. I mean that any number of people inside the intelligence organizations could have opted to "wiretap" Trump
This is not true. The system will not allow you to just query a US Person, and will automatically flag such requests for review if you try to do so. Even if an analyst conducted "reverse targeting" (Querying a foreign person who the US Person was communicating with), the US Person's information within the intercept(s) is automatically minimized and specific approval would be needed to de-anonymize it, including solid proof that the US Person was actually acting as a foreign adversary, such as a spy.
I have no ability to argue that there is not a conspiracy involving multiple people in NSA approving these and OGC turning a blind eye to it and the senate intel committee ignoring it and so on, that is not impossible I suppose, but the reality is very far from simply having the ability to go ahead and wiretap Trump with ease.
> and there would have been no audit trail and no warrant.
There is absolutely an audit trail, including non-repudation for the analyst who performed the query (They must use their smartcard or "PKI"). This is good, because if you do believe that something awry is going on, you can push for a very specific cause: Put together an independent committee of representatives, have them go through the security clearance process (for those who have not already done so) to be read-in on any necessary SCI compartments to review the data, and conduct a thorough investigation regarding the audit trails of any query regarding Trump and/or associates. I personally find this to be far-fetched, but it is at least a tangible action which you and anyone who shares the belief can push for.