A longtime Fox News analyst sharply criticized the network on Tuesday, denouncing the outlet as a "propaganda machine" devoted to President Trump, and saying that it was "wittingly harming our system of government for profit," in a stunning internal email announcing his exit from the company.

Ralph Peters, a US Army lieutenant colonel who served as a military analyst for Fox News, said he felt "compelled to explain" his departure from the company to colleagues, before skewering the network he has called home for years. Peters had been telling friends that he planned on leaving the network in a "nuclear" fashion, one of those friends told CNN.

"Four decades ago, I took an oath as a newly commissioned officer. I swore to 'support and defend the Constitution,' and that oath did not expire when I took off my uniform," Peters wrote in the letter sent to a handful of colleagues. "Today, I feel that Fox News is assaulting our constitutional order and the rule of law, while fostering corrosive and unjustified paranoia among viewers. Over my decade with Fox, I long was proud of the association. Now I am ashamed."

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