How did Frank realize the coup?

How did Frank realize the coup? - 2 Women Sitting on Beach

So in House of Cards episode 7 of season 5, while in the bunker, Frank realizes that it was all a coup against him. I'm confused as to how he realized this. He didn't exchange many words with Claire, yet somehow they figured it out.






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Mr Adabuga - the man behind Ghana’s 1981 coup exposes Rawlings




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