Comedian Billy Crystal gave an emotional tribute during Muhammad Ali's funeral on Friday, but may have sneaked in a low-key dig at Republican presidential nominee Donald Trump.

Crystal, a friend of The Champ's for more than 40 years, said at the end of his eulogy for the boxer in the KFC Yum! Center in Louisville, Kentucky that Ali 'taught us that life is best when you build bridges between people, not walls.'

That line Crystal said sounds similar to what Hillary Clinton said during her victory speech on Tuesday.

'We believe that cooperation is better than conflict, unity is better than division, empowerment is better than resentment, and bridges are better than walls,' the Democratic presidential candidate front-runner said.

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Comedian Billy Crystal gave an emotional tribute during Muhammad Ali's funeral (above) on Friday, but may have sneaked in a low-key dig at Republican presidential nominee Donald Trump

Crystal, a friend of The Champ's for more than 40 years, said at the end of his eulogy for the boxer that Ali 'taught us that life is best when you build bridges between people, not walls.' Pictured together above

The line Crystal said in what appears to be a dig at Donald Trump (above) sounds similar to what Hillary Clinton said during her victory speech on Tuesday

Her swipe at The Donald is in reference to his highly publicized campaign promise to build a wall on the border between Mexico and the United States.

The billionaire businessman has also said he would not allow Muslims to enter the United States if he is elected president.

Trump has not commented about Crystal's eulogy to Ali, who died last week at age 74 at a Phoenix-area hospital.

It's unclear if Crystal did indeed intend to use his closing remark as a rebuke Trump, but the actor's comments overall made for a touching and funny eulogy for Ali.

The actor, who made a name for himself as a stand-up comedian in 1974 by mimicking Ali and ABC sportscaster Howard Cosell, also recounted with the audience their first meeting.

Hillary Clinton's swipe at The Donald is in reference to his highly publicized campaign promise to build a wall on the border between Mexico and the United States. She is pictured above on Friday

It's unclear if Crystal (above) did indeed intend to use his closing remark as a rebuke Trump, but the actor's comments overall made for a touching and funny eulogy for Ali

'Here I was a white kid from Long Island imitating The Greatest of All Time- and he was loving it,' he said.

Crystal said Ali gave him a bear hug after his skit and sparked an unlikely friendship when he whispered in his ear: 'You're my little brother.'

He compared Ali to 'a tremendous bolt of lightning, created by Mother Nature out of thin air, a fantastic combination of power and beauty.

'We've seen still photographs of lightning at the moment of impact, ferocious in its strength, magnificent in its elegance,' he said.

'And at the moment of impact it lights up everything around it so you can see everything clearly. Muhammad Ali struck us in the middle of America's darkest night.

'Ali forced us to take a look at ourselves.'