"While it is unfortunate that this unjust conviction was not corrected during the boxer's lifetime, a posthumous pardon today represents the opportunity to reaffirm Jack Johnson's substantial contributions to our society and right this historical wrong", the letter said, according to CNN.
Trump said he received a phone call from Rocky actor Sylvester Stallone, who told him about Johnson's life story.
Said Trump: "His trials and tribulations were great, his life complex and controversial", Trump wrote from his Mar-a-Lago club in Florida.
Could Jack Johnson receive a presidential pardon more than 70 years after his death?
Chastised for his relationships - each of his three wives were white - Johnson was found guilty in 1913 of violating the Mann Act, a law which prevented the transport of women across state lines for an "immoral goal".
The champion later spent one year in prison for transporting a white woman across state lines, in a case that was largely seen to be racially motivated. After falling short in their first attempt at building a case against Johnson, assistant U.S. District Attorney Harry A. Parkin asked the Justice Department's Bureau of Investigation to "secure evidence [of] illegal transportation by Johnson of any other women for an immoral objective".
Lately, Senators John McCain (R-Arizona), Harry Reid (R-Kentucky) and Orrin Hatch (R-Utah) have advocated for Johnson's identify to be cleared.
Johnson was so masterful as a boxer that his story was reimagined in a play called "The Great White Hope", starring James Earl Jones.
Philadelphia 76ers turn garbage into gold in Game 4 victory
But for all of Embiid's struggles on the offensive end of the court, he still locked things down in the paint like no other. Ben Simmons is averaging 19.3 points and 9.8 assists while Dario Saric is averaging 18.8 points and 7.3 rebounds.
Johnson returned to the U.S.in 1920 to serve his sentence and was released almost one year later.
He died in a vehicle wreck in 1946.
The boxer served almost a year in jail, which destroyed his career. He died in 1946 in an auto crash.
In 2016, a group of congressmen - including Sen. Bush pardoned Charles Winters in 2008, an American volunteer in the Arab-Israeli War convicted of violating the U.S. Neutrality Acts in 1949. This 12 months, McCain, Sen.
Trump isn't the first president to be asked to give Johnson a posthumous pardon.
Campaigns for posthumous pardons have been in motion since the turn of the century, but have not found much success.
Sen. Cory Booker also joined McCain, King and Rep. Gregory Meeks to introduce a resolution to get Johnson a pardon in March of 2017. "I hope President Trump will seize the chance earlier than him to proper this historic flawed and restore a terrific athlete's legacy".