An intelligence expert's looking at Donald Trump's reputation of walking back on threats.
An expletive laden social media post from the President over the the weekend warned Iran the US would destroy power infrastructure if it doesn't open the Strait of Hormuz by tomorrow.
Former CIA intelligence officer, Glenn Carle, says Trump often turns up the heat with ultimatums - before turning it down again.
"I wouldn't dismiss it - obviously, he lost the attack, but I find it hard to imagine that even he would obliterate the infrastructure of the country."
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