The reports I’ve seen indicates that Mazars USA is the accounting firm for the Trump Organization that was served with the original subpoena.
Yeah, that’s a big multi-national firm that I’ve worked with in the past. They will abide by all the professional ethics established by IFRS, GAAP, the FASB, the AICPA etc...
They risk their own business by not following the tax laws - especially in the global environment when things like BEPS, BEAT, Transfer Pricing and APA’s are becoming hot button items for the various countries.