As if China and Japan didn't have enough to worry about, Americans may be about to put a defaulter-in-chief in the White House.

Somehow, the typical oh-Donald-Trump-can't-be-elected assurances mean little to nations stuck with more than $1 trillion each of Treasuries on which The Donald says he'd effectively renege. "I am the king of debt," Trump told CNBC, devoid of any sense of irony. "I love debt. I love playing with it."

That's exactly what Xi Jinping and Shinzo Abe have to fear if the serial bankruptcy-filer from Queens wins the presidency. Nothing Trump could do in his first 100 days in office would do more to roil global markets and upend America's standing in Asia than playing fire with the one asset that still means something in this volatile world.