Strait of Hormuz: reopening challenges

He's sending more troops to the Middle East, while insisting the war in Iran is nearly over. 

So is Donald Trump preparing to pull out or digging in? 

If the US steps back, it's signalled other countries could be left to secure the Strait of Hormuz-- a vital global oil route-- on their own.

Today, defence strategist Kelly A. Grieco on why whatever comes next, the chaos is far from over.

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Kelly A. Grieco, Senior Fellow with the Reimagining US Grand Strategy Program at the Stimson Center