Probably a "national emergency" is declared then an Executive Order issued followed by the honoring of all government debt with the end game being resolved in the US Supreme Court.

The congress authorized the spending and the Treasury Department is obligated to make good on whatever further debt is required to pay on or pay the interest on that spending — case closed.

If there is any default, not likely in spite of the political bullshit, it will be for a matter of days.

*** Let's hope I am right because if there is a default — Argentina x 10,000