Presidents love foreign trips because diplomacy is in their control, allowing them to shape their legacy, John Zogby writes of Trump's China trip.

US News: US President Donald Trump departed for a high-stakes three-day visit to China on Tuesday, with trade expected to dominate talks with Chinese President.

US President Donald Trump is hoping for a foreign policy win at the upcoming summit with China's Xi Jinping. The Iran war, trade deals and Taiwan are expected to be high on the…