That's an intentional misreading, and you know it
Krugman says that there's all kinds of signs that they'll keep lending the US US dollars as long as the US is willing to pay them back in US dollars. The point here is that it looks like the House is hell bent on demonstrating that they aren't willing to pay back in US dollars for the money they've borrowed already, let alone future loans.
Seriously Box, strawmen are beneath you.