https://www.cato.org/blog/debt-ceiling-unconstitutional-what-about-default
The author of the above piece steps through the various arguments for and against the President unilaterally raising the debt limit. While the author would very much prefer that the President and Congress deal with this as adults, ultimately, he leaves the door open for the President to act unilaterally under the 14th Amendment.
The first thing we must realize is that the President faces no realistic penalty for taking this action. Impeachment is purely political. Yes, the House would impeach him for “abuse of power”. The Senate would likely either dismiss the charges without trial or acquit the President in short order. In other words, he faces no risk in taking such action.
Most likely, the courts will NOT interfere. As the author indicates, there is nobody with standing to oppose the policy and the courts would likely dismiss any case either for lack of standing or on the political question doctrine.
So no issue with the courts and in any event, if your going to ignore Congress on this, than you can just as easily ignore the courts.
But in the end, all would be good because the author supports the “SHALL NOT BE QUESTIONED” provision as forbidding a default and that in ignoring Congress, the President would actually be complying with the Constitution.
The author would prefer it not come to that.
But it is looking increasingly like the Biden administration will do just that, if a default becomes imminent.
And frankly, faced with two bad options (default or invoking the 14th Amendment), invoking the 14th Amendment is by far the less evil of the two options.
What is interesting is that if the President allowed a default, he would be forced to suspend or cancel spending authorized by Congress, thus opening ANOTHER can of worms. You can’t escape a Constitutional mess either way, but again, unilaterally raising the debt limit is clearly the far lesser of two evils. It preserves the full faith and credit of the United States and prevents the economic catastrophe that would result from a default.
But the article is short and worth the read, as it concisely sets out the argument in logical steps.