Bryan Cranston on Playing Powerful Role of President Lyndon B. Johnson

"All The Way" premieres Saturday on HBO.

Mackie has been asked to play King in the past, but this time, he said couldn't pass up the opportunity.

"For me, it was the first time in a script that I saw Dr. King portrayed the way I knew him to be," Mackie said. "He was a very radical thinker and speaker. I’d never seen him portrayed as such a great politician."

He added: "Dr. King and LBJ kind of has this innate ability to play both sides of the field. They could go into one side of the aisle, then go to the other side and meet in the middle somewhere because they were the great compromisers and that's something we don't see today in our society, our politics, at all."

"All The Way" premieres on Saturday on HBO.