Trudeau is under investigation ,not because he was on a yacht, but how he got there which supposedly broke the rules.  Ambrose left a paper trail with the ethics commissioner , and is not under investigation. That is essentially where we are with this story. If there was a problem with the Ambrose's trip, she would hardly launch an attack on Trudeau knowing that the tables could be turned on her. Trudeau's trip came out in bits and pieces, after the PMO initially stonewalled. No one cares where the interim leader goes, but she did contact the Ethics Commissioner. The logic here is if you are going to attack the PM, then first make sure you are not guilty of the same thing. Since the rules are not about the yacht , but how you got there, then you are fine. Most specifically the rules apply to the PM, which is why Seamus O'Reagan is not under investigation. The Liberals have a bad week again, and would love to change the channel. The more they refer to Ambrose, the worse the PM looks.