Fourth page, first paragraph begins by talking about the massive US debt that China holds. Then the author states this....
"Most likely these creditors will not call in their loans—if they ever did, there would be a global financial crisis."
Ok, the debt is issued as t-bills, notes and bonds. They either have call features or they don't. But even the rare ones that do have call features are callable by the US... not by the holders of the debt. The holders of the debt could certainly sell their bonds on the open market for whatever the going market rate is at the time of sale, but they cannot call the debt and have the US pay prior to the maturity of the debt. They could also refuse to buy additional debt issued by our inept government, but again that doesn't give them any ability to call in payment of the debt they hold.
This is likely the smartes thing the author put forth in the four pages....
"What is required is in some ways simple to describe: it amounts to ceasing our current behavior and doing exactly the opposite. It means not spending money that we don’t have, increasing taxes on the rich, reducing corporate welfare, strengthening the safety net for the less well off, and making greater investment in education, technology, and infrastructure."
The above quote almost redeems the authors ineptitude on the subject to that point. But obviously he is biased and doesn't like Bush (I cannot blame him for not liking Bush, but to place blame on the bad policies of the past 4 plus decades is quite sad).