first, it's not Trump called but CAI. second, Trump is not a dumb ass, he just wants to test the reaction of China. furthermore the policy of populism and antimainland of China is ruinning Taiwan itself. personally, I don't have special feeling to this case, cause every a period of time there will be some weird things in Taiwan. but the people who still think themselves as real Chinese as the same as ones in mainland are really pitifully. besides, the Democratic progressive party leaded by CAI made lots of insultment to the Chinese nation and don't think themselves as a part of it. that is so disgusting. I translated the answer from constantino87. and hope you can correct my mistakes.