Apparently he's still upset about the phone call with Taiwan being scrutinized and now it's snowballing to him getting mad about China having its military in the South China Sea.
Unbelievable.
China's leadership has become cocky because we sat back and let them do whatever they wanted for far too long. If we whipped those animals (the leaders, that is) into line when needed, they would not be making these types of offensive adventures. Does China ask our permission to behave like a petulant child on the global stage? America has direct interests in the region, including Guam, Saipan, the Trust Territories, and overseas military bases, not to mention our mutual security obligations. It's actually a disgrace that American leaders before Trump were so weak on China.