Trump said that "instead of talk", he is going to ask protesting players to suggest "people that they think were unfairly treated by the justice system".
Ali was sentenced to five years in prison in 1967 for refusing to be drafted into the Vietnam War, but he did not serve any prison time after winning an appeal.
Ali was convicted in 1967 of draft evasion. The president said football players have "seen a lot of abuse" and "a lot of unfairness" and that he wants their input on his use of this executive power. The U.S. Supreme Court overturned his conviction in 1971.
Amazon UK has an Xbox Games Pass subscription for half price
Xbox One S Console 500GB for $199: This is one of the best prices we've seen for a standalone new Xbox One S console. The company has announced that it's dropping the price of its 4K Xbox One X console for the first time.
Pippa Middleton confirms she is pregnant with her first child
She added to Waitrose Kitchen magazine: "This being my first pregnancy, I had so many questions I felt were still unanswered". The illness led to her being admitted to hospital, cancelling engagements and missing Prince George's first day of school.
Space Station For Sale: NASA Administrator Is In Talks With International Companies
Only 18 percent of respondents said NASA should send humans to Mars and even fewer think astronauts should return to the moon. Gerst is the only astronaut of the mission that had participated in a space mission in 2014.
"And he wasn't very popular then", Trump said as he left the White House en route to the G7 summit in Canada. "I'm thinking about Muhammad Ali, I'm thinking about that very seriously".
Last week, Trump pardoned conservative filmmaker Dinesh D'Souza.
The former Cassius Clay died in 2016 at the age of 74 due to septic shock brought on by a respiratory illness.