Vindman firing demonstrates all government officials are at the mercy of Trump's 'latest mood swing': Ex-NSC official
US President Donald Trump, pictured on July 8, has assailed Britain's US ambassador as a "pompous fool" and slammed outgoing premier Theresa May's "foolish" policies following a leak of unflattering diplomatic cables. (AFP/File / NICHOLAS KAMM)

On Friday, former National Security Council official Samantha Vinograd weighed in on the dismissal of Lt. Col. Alexander Vindman — and warned that it is yet another sign of how the president's short-term whims and vendettas are undermining America's ability to conduct national security policy.

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