Ali refused to be inducted into the US military in 1967 during the Vietnam War, citing religious objections.
Trump told reporters as he left the White House for a meeting with in Canada with USA allies that his team was "looking at literally thousands of names" of people for potential pardons because they were treated unfairly or their sentences are too long.
"I'm thinking about somebody that you all know very well, and he went through a lot".
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Afghan president announces temporary ceasefire with Taliban
Since the war in Afghanistan began in October 2001, the USA has devoted about $ 80 billion to develop the ANDSF. But analysts say that security conditions have since deteriorated across Afghanistan causing record bloodshed.
After refusing to serve, he was stripped of his boxing titles and did not fight for three years while he appealed, until his conviction was overturned in 1971.
Mr Trump also recently said he has the "absolute right" to pardon himself in the Russian Federation inquiry, although he insists he has done nothing wrong. Ali died in 2016 at the age of 74. Johnson was convicted in 1913 by an all-white jury of violating the Mann Act for traveling with his white girlfriend.
Earlier this week, Trump commuted the life sentence for Alice Marie Johnson, who was serving a life sentence for a first-time nonviolent drug offense, after a high-profile campaign for clemency by reality television star Kim Kardashian West.