You have a lawyer to advise you on the law.

You can ask can I do this? Is it legal?

If you got charged committing a crime for something your lawyer told you was illegal, you could tell them I relied on the advice of my counsel.

However, if you want to raise that as a legal defense then you're giving up lawyer confidentiality privilege. And the prosecutors will get to see your communications with your council to see if this actually occurred.

So back in March Trump had to indicate if he was going to use this defense, he chose not to. If he declared he was going to use it, the DA could have gotten much more discovery from him.

So they tried something called presence of counseln then involvement of counsel and the judge would not let them do i See this filing, search for this section

People's VI: Motion to Exclude Arguments Regarding Any Alleged Reliance on Advice of Counsel Unless and Until Defendant Establishes A Sufficient Factual Predicate for that Defense

This Court now rules that Defendant may not offer, or even suggest, the defense of "presence-of-counsel." To allow said defense in this matter would effectively permit Defendant to invoke the very defense he has declared he will not rely upon, without the concomitant obligations that come with it. https://law.justia.com/cases/new-york/other-courts/2024/2024-ny-slip-op-24121.html

Trump's lawyers tried again last week to use and the judge shot them down

https://www.politico.com/live-updates/2024/05/21/trump-hush-money-criminal-trial/judge-scolds-trump-lawyer-00159247t