Trump has already granted a posthumous pardon to Jack Johnson, the first black heavyweight champion in boxing history.
Ali - who changed his name from Cassius Clay when he converted to Islam in 1964 - said his refusal to be drafted in 1966 was based on his religious beliefs and his opposition to the United States' involvement in the Vietnam War. The unanimous decision overturned Ali's 1967 conviction, meaning his application for conscientious objector status should have been granted and he was not a draft dodger.
Ali's legal fight ended in 1971, however, when the Supreme Court reversed the conviction 8-0, so a presidential pardon might be superfluous.
"This was quite a surprise to everybody this morning when we heard about it", he said Friday during a phone interview.
Well, Trump couldn't be too serious about pardoning the late boxer, who died in 2016.
Earlier this week, a White House official reportedly called pardons the president's new "favorite thing" to discuss and the billionaire is reportedly "obsessed" with them. But his real motive seems to be pardoning his favorite person of all - himself.
In 1977, President Jimmy Carter, on his first day in office, issued a blanket pardon for all of the hundreds of thousands of USA men who evaded the draft during the Vietnam War.
A pardon does not technically erase a conviction; it is an expression of forgiveness from the president that, in most cases, serves to undo the punishment and help the recipient of the pardon restore rights, such as the right to vote.
Even Ali's lawyer Ron Tweel said the pardon is "unnecessary" saying "there is no conviction from which a pardon is needed".
"I think [Trump] probably was a fan of Ali and he thought he would say something positive about him".
Ali is considered one of the greatest boxers of all time. "I'm thinking about somebody that you all know very well and he went through a lot and he wasn't very popular then".
The similarities between Ali and former San Francisco 49ers quarterback Colin Kaepernick, who started the controversial protests against racism and police violence by kneeling during the national anthem, have been noted by those who have studied two men.
Ahead of travelling to the G-7 Summit in Canada, Trump said he was considering posthumously pardoning Muhammad Ali.
In his comments Friday, Trump said he was looking at a list of what he described as 3,000 names of people who could be pardoned because "some folks that have sentences that aren't fair".