Donald Trump's campaign was full of tough talk about China. As President, he's talking tougher than ever -- especially about North Korea, which fired another missile yesterday. Tomorrow, at Mar-a-Lago, the President will give China's President Xi Jinping the full VIP treatment. Veteran diplomats say this week's summit is premature. By failing to demand any concessions from President Xi in advance of the meeting, did Trump give up an important advantage?