Former President Obama wished Boston Celtics legend Bill Russell a happy birthday on Tuesday, lauding the NBA hall of famer as "the greatest champion in American sports, and a lifelong warrior for justice."

Russell turned 85 on Tuesday. He is among the most decorated athletes in history, winning five Most Valuable Player Awards, 11 NBA championships and an Olympic gold medal.

ADVERTISEMENT

Obama, a well-documented basketball fan, awarded Russell the Presidential Medal of Freedom in 2011. The then-president documented Russell's presence during the civil rights movement. Russell regularly spoke out against racism, and supported Muhammed Ali's refusal to be drafted into service in the Vietnam War.

"I hope that one day, in the streets of Boston, children will look up at a statue built not only to Bill Russell the player, but Bill Russell the man," Obama said in the 2011 ceremony.

Russell has remained outspoken about social justice issues. Last year, he posed for a photo while taking a knee and wearing the Medal of Freedom, an act of solidarity with NFL players protesting racism during the national anthem.

Last August, Russell said getting criticized by President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE "means you must be doing something right!”