In one sense, this is a small thing. There isn't any allegation that the recordings caught privileged attorney-client communication or jury deliberations. But it is an attack on the integrity of the legal system, and it's part of a pattern of attacks on the legal system that adds up to a serious threat to the rule of law.
Defendants are asking for these recordings to be quashed. That is what is customary, but it is not sufficient; there need to be consequences for those who did it and who authorized it. The defendants are only incentivized to argue as far as necessary for their own defense; it is up to the judges to censure the parties responsible.