Insiders portray defense secretary as increasingly isolated after officers with impeccable reputations forced out

Since Donald Trump’s first term, they have been viewed comfortingly as the “adults in the room,” a last line of defense against the impulsive whims of a president with access to the nuclear codes.

Now – after an unprecedented wave of firings that has been compared by some to Stalin’s purges – the Pentagon top brass no longer seem like such a reliable bulwark.

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