It's shocking how dim this man is.
I saw the photo like the rest of us, and it is instantly obvious that the "MS13" was digitally added - it's utterly disconnected from the object (hand) contours and of a uniform opacity. I thought the purpose of the (obviously) added text was to indicate that each inked image below the letters stood for / represented that letter - I don't know anything about gang tat symbology.
But trump believes they are actually a part of the tattoo on that poor (probably now deceased) guy's hand. I just did not realize he was quite that dim.
https://gizmodo.com/trump-really-believes-his-fake-ms-13-tattoo-photo-is-real-2000596365