@kevin

The problem is that it doesn't matter what the president wants to be true, he does not have authorities that he does not have.

Should Biden try to sell debt that was not authorized by law, then whoever buys that debt will be buying Monopoly money, and the US would have zero obligation to actually pay it back, so it would be really stupid for anybody to actually buy it.

I mean I would also think it to be impeachable for a president to engage in such a scam, but that is a secondary concern.