Which US President's portrait on the $20 bill was replaced with that of Andrew Jackson in 1928?

The United States twenty-dollar bill ($20) is a denomination of U.S. currency. The seventh US President (1829–37), Andrew Jackson has been featured on the front side of the bill since 1928, while the White House is featured on the reverse side. Although it coincides with the 100th anniversary of Jackson's election as president, it is not clear the reason the bill was switched from Grover Cleveland (22nd and 24th US President) to Andrew Jackson. Grover Cleveland's portrait was featured on the front of the $20 bill beginning in 1914. According to the U.S. Treasury, "Treasury Department records do not reveal the reason that portraits of these particular statesmen were chosen in preference to those of other persons of equal importance and prominence."

On April 20, 2016, it was announced that the new design of the $20 bill expected to be unveiled in 2020 (the 100th anniversary of the 19th Amendment), will have a portrait of Harriet Tubman on the front.