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Mike Pence came out and said this was a courtesy call, then Donald Trump a few hours later went on Twitter, as is his wont, and essentially linked the call to Taiwan with a whole series of things he doesn't like about Chinese economic and foreign policies and implied that the U.S. views of the status of Taiwan are now up for negotiation, that he wants them to be part of a broader negotiation with China about a whole series of economic and foreign policy issues. So, we just don't really know what exactly they're planing to do with this.
