...From Geinther's January 6 letter to Congress, describing the consequences of not raising the debt ceiling:....
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After going through a few of the finger-in-the-dike options for buying a few weeks or months of extra time, the letter has some gloomy answers to the Op's question:
"...if Congress were to fail to act, the specific consequences would be as follows:...<snip>
Awful Stuff...
For these reasons, any default on the legal debt obligations of the United States is unthinkable and must be avoided..."