Nizar Zakka knows exactly what it’s like to be left behind in a U.S. hostage deal with Iran in which billions of dollars were exchanged.In 2016, Zakka and his family believed he would be included in a hostage deal negotiated by the Obama administration in which the U.S. government provided $1.7 billion in assets to Tehran, including $400 million paid in cash and delivered to the Iranian government by a U.S. military plane.