If I told a lawyer to break the law, am I responsible if he decides to do it?
likely yes, but you’d be responsible in a different way than the lawyer making the choice to follow what you told them to do - especially since it’s the lawyer’s profession and responsibility to know the law and work within the law, not break it, so they are at greater fault. Stating “I was told to” changes nothing about the fault of the lawyer. Just as judges, police, etc know and work with the law and when they break it they have no excuse to say they were told to.
I just don't see the POTUS liability. It's not his signature on the checks that went to the women. If he reimbursed them later, the lawyer probably sent a bill for expenses.