What worries me is that we may only be hearing about Flynn's antics because the Acting Attorney General was a holdover from the Obama administration; would Jeff Sessions have ordered the same FBI investigation?
A couple things the alt-media isn't telling you:
1) The Japanese yen is a free-floating currency, that is, it is traded around the world and thus its value is determined by various markets' faith in the value of the currency, the same as the US dollar or EU euro. The Chinese renminbi is valued based on a basket of world currencies. While the US dollar seems to weigh heavily, other major currencies such as the euro and the pound sterling are included in the calculation.
2) US government debt does not exist in the form of puttable bonds, in other words a lender cannot "call in" their loan; instead the bonds and treasuries pay out a fixed amount over a fixed period of time. China can and does sell their bonds, but doing so does not harm the US economy; in fact it's generally seen as a warning sign for the Chinese economy. Besides slowing growth and a transition from a production to a consumption economy, China is facing massive capital flight (rich Chinese parking their assets outside China). The country has also burned through over half a billion dollars worth of foreign currency reserves in an attempt to prop up the renminbi and has additionally sold over $300 billion in treasuries (US bonds). On top of all that, there is a bad debt problem looming in China that could make the Great Recession look like an off year.