** If Trump paid for the advice, then privilege was breached. Otherwise, you get what you pay for. **
Untrue. Model Rules for ethical behavior, and confidentiality
are not based on the occurrence of a monetary transaction.
IMHO, he let his rabid support for Hillary override any moral or ethical standards, and hoped his comment might impugn Trump, or cast some aspersions upon him.
Or maybe Tribe is getting senile dementia, and needs to be put out to pasture.
However, I still try to treat them fairly. According to Tribe, Trump called him for advice which Tribe provided. There is no mention of paying for Tribe's time, Trump requesting the contact be confidential, or of Trump actually using his services. All Tribe has done that I have seen is state that Trump called him for advice, nothing about what was discussed.
IMHO Trump is smart enough that if he is going to use a lawyer, to ensure there is attorney client privilege. And to put things in perspective, Trump overcame association with the Clintons (pictures, party, golf, etc), the Tribe thing is basically a non story.