As I understand, paying the debt interest obligations is first on the pay list. Before anything else.
The monthly income into the government coffers is many times that needed to service the debt.
IOW for the Country to default on loans would require a conscience effort/edict to bring about. And I don't know if that is even possible.
If that is true then a default can be laid squarely at the feet on Zer0.
But, Obastard is an outlaw President. He has openly defied court decisions. Look at what his DoJ is doing with NC and TX: Challenging their election laws in the face of a SCOTUS decision to the contrary. He openly defied an appeals court ruling so he could close all the oil drilling in the Gulf of Mexico.