Let's start with Iran, the main target of Trump's wrath this week. The president has pulled the United States out of the nuclear deal negotiated with Tehran by Washington and its European allies, and endorsed by the U.N. Security Council. Trump's rationale: The deal failed to address Iran's work on missiles or its aggressive behavior in the region, and had a sunset clause that would eliminate key curbs on Tehran's nuclear program after 10 to 15 years.