Updated

President Trump Saturday said that he is considering a “full pardon” for boxing’s first black heavyweight champion, Jack Johnson, after being urged to do so by “Rocky” actor Sylvester Stallone.

Trump said that Stallone had called him and told him about Johnson, and that he is now considering a posthumous pardon. Stallone is a Trump supporter and attended his New Years' Eve Party in 2016, according to The Associated Press.

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

Johnson, born in Galveston, Texas, was the target of racial resentment, particularly after he defeated white boxer James Jeffries in the 1910 “Fight of the Century,” a bout that sparked race riots. Three years later he was convicted by an all-white jury of violating the Mann Act, which made it illegal to transport a woman across state lines for “immoral” purposes.

In their efforts to prosecute Johnson, authorities first targeted Johnson's relationship with the woman in question, Lucille Cameron, who later became his wife, but she refused to cooperate.

But they found another white witness, Belle Schreiber, to testify against him. Johnson fled the country after his conviction, but he agreed years later to return and serve a 10-month jail sentence. He died in 1946.

Sen. John McCain, R-Ariz., has been calling for a pardon for Johnson since 2004, and criticized President Obama for leaving office in 2017 without having granted one. Former Senate Majority Leader Harry Reid, D-Nev., had also called for a pardon.

“Johnson’s imprisonment forced him into the shadows of bigotry and prejudice, and continues to stand as a shameful stain on our nation’s history,” McCain said in a statement in January 2017. 

3af56616-johnson

Trump is considering a pardon for boxer Jack Johnson. (AP)

Johnson’s great-great niece has also pressed Trump for a pardon.

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; he was framed for embezzlement. Bush pardoned Charles Winters in 2008, an American volunteer in the Arab-Israeli War convicted of violating the U.S. Neutrality Acts in 1949.

Fox News’ Ben Florance and The Associated Press contributed to this report.