China and Japan were among the nations that reduced US debt holdings in April.
The legal issues raised in the case against the deal are likely to arise again with General Motors.
The rate of increase is expected to slow, with prices peaking well below last summer's highs.
The giant’s revival will help cushion the blow of falling global output. But the Obama administration will need to take care in its dealings.
Higher US rates signal an economy on the mend, but they could also extend the housing slump and add to the federal debt.
The auto company would have to bounce back to sustained profits before the US government would get any money back.