DES MOINES, Iowa — A Republican congressman is trying to block the Treasury from redesigning all US currency because it is “racist” and “sexist” to replace Andrew Jackson with abolitionist Harriet Tubman on the $20 bill.

Rep. Steve King of Iowa has offered an amendment to a spending bill barring the use of funds to redesign any Federal Reserve note or coin.

“It’s not about Harriet Tubman, it’s about keeping the picture on the $20,” King told Politico. “Y’know? Why would you want to change that? I am a conservative, I like to keep what we have.”

“Here’s what’s really happening: This is liberal activism on the part of the president that’s trying to identify people by categories, and he’s divided us on the lines of groups. … This is a divisive proposal on the part of the president, and mine’s unifying. It says just don’t change anything.”

Under plans announced in April by Treasury Secretary Jacob Lew, Tubman would replace Andrew Jackson on the front of the $20 bill. The abolitionist and former slave who was a leader of the Underground Railroad will become the first African-American featured on US paper currency and the first woman on paper currency in a century.

Jackson, the nation’s seventh president, will be moved to the back of the $20 bill, which will also retain an image of the White House on the back.

King is not the only Republican to come out against changing the $20 bill. In April, presumptive Republican nominee Donald Trump said that the move was “pure political correctness” and instead suggested putting Tubman on the $2 bill.

Alexander Hamilton’s portrait will remain on the front of the $10 bill. The back, which now features the Treasury building in Washington, will be redesigned to commemorate a 1913 suffragette march and feature famous suffragette leaders including Susan B. Anthony.

The $5 bill will retain Abraham Lincoln on the front. The back, which now features the Lincoln Memorial, will be redesigned to include important civil rights events at the memorial including Martin Luther King’s “I have a dream” speech and a 1939 concert by African-American opera singer Marian Anderson.

King is a conservative Republican known for his outspoken criticism of US immigration policy. His Democratic opponent in Iowa, Kim Weaver, said it’s “a headline-grabbing piece of stunt legislation.”

“And what chance does this meaningless and mean-spirited gesture have of actually passing? Just like most measures introduced by Steve King, none,” she said.