Bizarre decision. Quoted in full:
Treasury Secretary Jack Lew confirmed late Wednesday that the Bureau of Printing and Engraving is preparing a plan to put a woman on the $10 bill. The woman, who has not yet been selected (here are some good ideas), will apparently appear alongside Alexander Hamilton on the bill.
Rather than resort to this odd arrangement, a better idea would be to take Andrew Jackson off the $20, as Jillian Keenan has argued. Many presidents oversaw mistreatment of American Indians, but Jackson's policies in this regard were especially egregious. He was also a proponent of slavery, and his crank monetary policies — including an opposition to paper money — make him almost uniquely unsuited for a role on currency.
Hamilton had his flaws and the case for putting a woman on American currency is strong, but Jackson is far and away the best candidate for removal.