Sen. Charles Schumer wants to know why the Treasury Department is holding up plans to place Harriet Tubman's likeness on the $20 bill.

The Democratic leader asked the Treasury's inspector general on Wednesday to open a probe into the delayed redesign. The new bill featuring the abolitionist was set to debut next year, the centennial of the 19th Amendment granting women the right to vote. Treasury Secretary Steven Mnuchin announced last month the new bill will be delayed until 2028 and may not even feature Tubman.

Schumer wrote that he doubted Mnuchin's claim that the delay was necessary for "anti-counterfeiting" measures. He wants Treasury Inspector General Eric Thorson to investigate whether the White House had any role in the delay. Schumer noted that President Donald Trump called efforts to replace President Andrew Jackson on the bill "pure political correctness" while campaigning in 2016.