Playing Chicken In The Straits Of Hormuz - Red Lines And War Talk

After designating Iran's Revolutionary Guard a terrorist organization, will the US make a physical attempt to shut down any oil export by citing the oil business's relationship with the Iranian Guard? Will Iran make good on its threat to shut down the Hormuz Straits, which would take out 20 percent of the oil from the world market? Clearly Trump's sights are set on Iran. How far will he go?