Blow Back by James Patterson, Brendan DuBois

He's America's most brilliant president ever. He's also a psychopath.
US president Keegan Barrett swept into office on his success as director of the CIA. Six months into his first term, he devises a clandestine power grab with a deadly motive: Revenge.
President Barrett personally orders Special Agents Liam Grey and Noa Himel to execute his plan, but their loyalties are divided. As CIA agents they've sworn to support and defend the Constitution of the United States against all threats, both foreign and domestic.
When the threat comes directly from the Oval Office, that's where the blowback begins.

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