WASHINGTON (CBS/AP) — President Donald Trump on Thursday granted a rare posthumous pardon to boxing’s first black heavyweight champion, clearing Jack Johnson’s name more than 100 years after what many see as his racially charged conviction in Chicago.

Jack Johnson, right, world heavyweight title holder since 1908, in action against Jess Willard of the USA at Havana, Cuba in 1915. Willard took the title with a knockout in the 26th round and held onto it until 1919. (Credit: Topical Press Agency/Getty Images)

“It’s my honor to do it. It’s about time,” Trump said during an Oval Office ceremony, where he was joined by boxer Lennox Lewis and actor Sylvester Stallone, who has drawn awareness to Johnson’s cause.

Johnson lived for a time in Chicago and owned a nightclub here, according to Ken Burn’s PBS documentary on the boxer’s life. He is buried with his first wife, Etta Duryea, at Graceland Cemetery. Duryea took her own life in 1912. Johnson was killed in a car crash in North Carolina in 1946.

Authorities arrested Johnson in Chicago and he was eventually charged with violating the Mann Act. Johnson was convicted in 1913 by an all-white jury in Chicago for violating the act, which made it illegal to transport women across state lines for “immoral” purposes, for traveling with white women.

One of those women was Lucille Cameron, who Johnson met in Chicago and later married. Johnson wasn’t convicted for his relationship with her as that case fell apart, according to the Burns documentary. He was found guilty for traveling a few years before with Belle Schreiber, who became the star witness in the case.

5th April 1915: Jack Johnson is counted out by the referee after being knocked out in the 26th round by Jess Willard during their World Heavyweight title in Havana, Cuba. Willard took the title which Johnson had held since 1908. (CREDIT: Hulton Archive/Getty Images)

Trump said Johnson had served 10 months in prison for what many view as a racially-motivated injustice and described his decision as an effort “to correct a wrong in our history.”

“He represented something that was both very beautiful and very terrible at the same time,” Trump said.

Trump had said previously that Stallone had brought Johnson’s story to his attention in a phone call.

“His trials and tribulations were great, his life complex and controversial,” Trump tweeted in April. “Others have looked at this over the years, most thought it would be done, but yes, I am considering a Full Pardon!”

Johnson is a legendary figure in boxing and crossed over into popular culture decades ago with biographies, dramas and documentaries following the civil rights era.

Publicity still of American boxer Jack Johnson in the boxing documentary ‘Jack Johnson’ (Big Fights/Continental Pictures), 1970. (CREDIT: John D. Kisch/Separate Cinema Archive/Getty Images)

His great-great niece has pressed Trump for a posthumous pardon, and Sen. John McCain, R-Ariz., and former Senate Majority Leader Harry Reid, D-Nev., have been pushing Johnson’s case for years.

The son of former slaves, Johnson defeated Tommy Burns for the heavyweight title in 1908 at a time when blacks and whites rarely entered the same ring. He then mowed down a series of “great white hopes,” culminating in 1910 with the undefeated former champion, James J. Jeffries.

McCain previously told The Associated Press that Johnson “was a boxing legend and pioneer whose career and reputation were ruined by a racially charged conviction more than a century ago.”

“Johnson’s imprisonment forced him into the shadows of bigotry and prejudice, and continues to stand as a stain on our national honor,” McCain has said.

American heavyweight boxer Jack Johnson in action sparring. (CREDIT: Topical Press Agency/Getty Images)

Posthumous pardons are rare, but not unprecedented. President Bill Clinton pardoned Henry O. Flipper, the first African-American officer to lead the Buffalo Soldiers of the 10th Cavalry Regiment during the Civil War, and Bush pardoned Charles Winters, an American volunteer in the Arab-Israeli War convicted of violating the U.S. Neutrality Acts in 1949.

Linda E. Haywood, the great-great niece, wanted Barack Obama, the nation’s first black president, to pardon Johnson, but Justice Department policy says “processing posthumous pardon petitions is grounded in the belief that the time of the officials involved in the clemency process is better spent on the pardon and commutation requests of living persons.”

The Justice Department makes decisions on potential pardons through an application process and typically makes recommendations to the president. The general DOJ policy is to not accept applications for posthumous pardons for federal convictions, according to the department’s website. But Trump has shown a willingness to work around the DOJ process in the past.