In this instance, it sounds like the customer was wrong. If you have currency that is noticably marked up or defaced, it has then lost it’s trading value. This has nothing to do with Trump per se. The paper is marked up. The cashier suggested several options for the customer. The options were rejected. The customer was wrong.so...if I get a $20 bill from an ATM with writing on it, I need to argue with the bank to replace it?