Inside the unraveling between Trump, Comey

President Trump praised then-FBI Director James Comey while on the campaign trail but his relationship with Comey appeared to sour once he took office and ended with Comey's surprise firing.
2:16 | 05/18/17

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Transcript for Inside the unraveling between Trump, Comey
We'll move on to more on that looming showdown between president trump and the FBI director. He fired James Comey. It will play out with the special prosecutor on capitol hill. The course of this at stake and Tom llamas here with a closer look at how the relationship unraveled. Good morning, Tom. George, good morning to you. We spoke with people who know both men very well and who predict a fight is coming. Also that neither will back off or back down. The battle between president trump and former FBI director James Comey heating up and setting up what could be a Washington showdown for the ages. He's become more famous than me. Reporter: At first trump seemed to like Comey. It took guts for director Comey to make the move that he made. Reporter: But then Comey testified before congress describing the moment the bureau had to re-open the Clinton e-mail investigation just days before the election. It makes me mildly nauseous to think that we might have had some impact on the election but honestly, it wouldn't change the decision. Reporter: Just days later Comey was out. He's a showboat. He's a grandstander. Reporter: Now with Comey likely to testify again about president trump allegedly telling him to lay off Flynn, the two powerful men are pitted against each other. One thing I can tell you about Donald Trump, he's very tough and it's always a mistake to underestimate him. Reporter: The president close friend and one-time adviser Roger stone says Comey is out for retribution. I think this memo he put forward is kind of the classic Washington bureaucratic revenge play. If Mr. Comey thought the president was trying to obstruct justice why didn't he say so at the time? Reporter: But those that know the former FBI director say that he is one tough customer, unafraid to go into battle even with the president. James Comey is going to survive this. He has survived many different hard controversies in his career and I think Comey's integrity and legacy are completely intact. Reporter: In his testimony before congress, James Comey said he wished he could just spend time by the waters of Connecticut with his invitation to testify again this time about his conversations with president trump, he'll be back by the potomac, George.

This transcript has been automatically generated and may not be 100% accurate.

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