Treasury Secretary Steven Mnuchin declined Thursday to commit to his predecessor's plan to replace Andrew Jackson with Harriet Tubman on the face of the $20 bill.

"People have been on the bills for a long period of time, this is something we'll consider," Mnuchin said when asked about the proposed currency change by Steve Liesman on CNBC.

Mnuchin said that there were much more important and pressing matters on his agenda, and that the change "is not something we're focused on."

Obama Treasury Secretary Jack Lew had proposed putting the abolitionist Tubman on the front of the $20 bill last year, partly in response to rising controversy over the legacy of Jackson.

Donald Trump criticized the decision at the time, calling it "pure political correctness" while on the campaign trail.

"Andrew Jackson had a great history, and I think it's very rough when you take someone off the bill," Trump said on the "Today" show.

Mnuchin said Thursday the major motivation for changing currency is preventing counterfeits.