Treasury Secretary Steven Mnuchin said Thursday that his department has no plans to replace President Andrew Jackson on the $20 bill, despite the Treasury making the proposal last year.

Mnuchin told CNBC, "Ultimately we will be looking at this issue. It's not something I'm focused on at the moment."

He added that he would rather focus on changing currency to combat counterfeiting.

"The No. 1 issue why we change the currency is to stop counterfeiting. So the issues of what we change will be primarily related to what we need to do for security purposes. I've received classified briefings on that. And that's what I'm focused on for the most part," Mnuchin said.

"People have been on the bills for a long period of time. And this is something we will consider. Right now, we've got a lot more important issues to focus on," he added.

Former Secretary of the Treasury Jack Lew, in the previous administration, suggested replacing Jackson, a slave-owner, with Harriet Tubman. Trump voiced support for Tubman being put on currency during his presidential campaign, but not with replacing Jackson.

"I think Harriet Tubman is fantastic," he said on NBC's "Today" show last year in April. "I would love to leave Andrew Jackson and see if we can maybe come up with another denomination. Maybe we do the $2 bill or we do another bill."

While Trump complimented Tubman, he said at the time that he didn't agree with replacing Jackson on the denomination. "I don't like seeing it. Yes, I think it's pure political correctness. Been on the bill [Jackson] for many, many years. And, you know, really represented somebody that really was very important to this country.