US Navy photo by Mass Communication Specialist 2nd Class Brian Caracci Iran's navy made a point of harassing and humiliating the US Navy in 2016 after then-President Barack Obama had sealed the Iran deal, but under President Donald Trump, they have stopped. The US Navy openly acknowledges the shift in tactics from Iran, which an expert told Business Insider was based on Trump's unpredictability and credibility with regard to military strikes. But Iran has kept up its anti-US regional activity and encountered little resistance after toning down the more visible naval encounters.