Except that's not how the federal government works.
The full faith and credit are executive branch functions, not legislative branch. The legislative branch has no control over the executive branch paying its debt obligations.
I know a lot of places are reporting as if it is, but they are misreporting issues of basic civics, basic functions of the federal government.
The executive branch has to pay its obligations. It doesn't matter what Congress does, the executive branch must pay the debts as they come due. They have enough money to do so, so they constitutionally must do so.
If the president decides not to pay his obligations, that would be an impeachable offense.