What they say and what they do are two different things. Trump and co don't want US hegemony to end, what they don't want is the liabilities that comes with being the global hegemon.Lmao, why does the US need to create casus belli for war now? They've had casus belli for war with China since 1949. If anything the US is looking for a way to out of their Taiwan commitments, saving face for the inevitable reunifcation of China.
US unipolar hegemony is already gone, the whole world recognizes it, even Marco Rubio admits it.
They need to create casus belli for war because it's the only way they can get crew (UK, EU, Japan, and maybe South Korea) together, form like Voltron and take on China. The Americans are losing confidence that they can go to war with China on their own (nevermind what internet nerds think). If the US confronted and attacked China on it's own without the crew.