When he “delayed” replacing Donald Trump fave and slave owner President Andrew Jackson’s face on the $20 bill with that of freedom fighter Harriet Tubman, Treasury Secretary Steve Mnuchin swore before Congress that “technical” issues concerning new security features on U.S. bills were the reason.
source https://www.theroot.com/what-would-a-harriet-tubman-20-bill-look-like-here-s-1835534819