WATCH: Former Secretary of State Rex Tillerson is speaking publicly about what led to his firing in March by President Trump. CBS News political contributor @bobschieffer interviewed Tillerson in Houston last night, at a dinner to benefit MD Anderson Cancer Center. pic.twitter.com/47qDqcsrMs — CBS This Morning (@CBSThisMorning) December 7, 2018

Former Secretary of State Rex Tillerson offered some revealing comments about President Trump on Thursday in a rare interview with CBS New’ Bob Schieffer.

As the former Exxon Mobil CEO partook in a fundraiser at the MD Anderson Cancer Center in Houston, he opened up about what caused Trump to fire him earlier this year. Tillerson said he never met Trump before he was offered the secretary of state job, and he found it “challenging” for them to work together since Trump is “a man who’s undisciplined, doesn’t like to read, doesn’t read briefing reports, doesn’t like to get into the details of a lot of things but rather says ‘this is what I believe.'”

Houston Chronicle picked up other elements of the conversation in which, Tillerson explained that he and Trump operated on different value systems. This apparently caused Trump to get frustrated with him whenever he tried to tell the president he must follow legal protocol instead of just doing whatever he feels like.

“So often, the president would say here’s what I want to do and here’s how I want to do it and I would have to say to him, ‘Mr. President I understand what you want to do but you can’t do it that way. It violates the law,'” Tillerson said. “I’d say ‘here’s what we can do, we can go back to Congress and get this law changed. And if that’s what you want to do, there’s nothing wrong with that.’ I told him I’m ready to go up there and fight the fight, if that’s what you want to do.”

Other fascinating tidbits include the moment when Tillerson voiced his certainty that Russia interfered with the 2016 election as part of Vladimir Putin‘s broader campaign to undermine American institutions. Tillerson also expressed a degree of concern with how big of a splash Trump can make on the political world just by using Twitter.

“I will be honest with you, it troubles me that the American people seem to want to know so little about issues, that they are satisfied with a 128 characters…I don’t want that to come across as a criticism of him. It’s really a concern that I have about us as Americans and us as a society and us as citizens.”

Watch above, via CBS.

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