Roman emperors lacked mass media and the internet, so they relied on their images on coins to get the message across. Fittingly enough for a man who frequently resembles Caligula, Trump appears to be trying the same thing. Will it work for him?
No, because we have mass media and the internet. We also use credit cards more often than cash. It is unlikely that putting Trump’s signature and image on currency will win him much support, although his ego will undoubtedly be gratified.
The better question is, did the Treasury pay him for the use of his image? It would be unlike him not to demand a cut from the transaction.