Trump arrives for meeting with China's President Xi Jinping

Tonight on The Last Word: Donald Trump’s war in Iran looms over the U.S.-China summit. Also, economists predicted the failures of Trump’s economy. And The Wall Street Journal reports the Trump administration is eyeing 250 pardons for July 4th. Laura Barrón-López, Rep. Madeleine Dean, Bobby Ghosh, Justin Wolfers, and Melissa Murray join Ali Velshi.