So, since I'm more likely to have a $1 bill in my wallet than a $20, I looked at the backs of one's and five's and they don't really lend themselves to this sort of stamp.
So I said to myself, "Self... you should google 'Trump Stamp'".
I'll just say I should have remembered Rule 34
There were others, including one on a lib that will most likely regret his choice in tattoo in maybe 20 - 30 years...
Ok, so where can I buy a self inking stamp like this, with a stylized face / hair of Trump. I'll just stamp that on anything I see...