. >> nbc's ian williams is live in beijing. why is this trip so significant in. >> hi, milissa, well coming to this part of the world, china, the pacific rim is always important. politically, economically. but i think the timing this time is very significant, coming so soon after the political battering which the president took last week. here his rivals and his allies will be asking what impact that will have on his ability to do business overseas, on his foreign policy, on his ability to represent robustly american interests, particularly against china and also to represent and to push the interests of his allies. now, he turned up this morning, arriving here in beijing to blue skies. that's pretty incredible. and it was only achieved by his chinese hosts, pretty well shutting down a good chunk of northern china, kicking cows off the roads, closing factories and building sites to keep smog away. cynics say that shows the power they have here and the way that president xi jinping consolidated that power. in contrast as the chi