the run-up to the last bitter debt-ceiling battle, in 2011, US and world financial markets were roiled and the US stock market declined by close to 20%.
https://www.google.com/amp/s/nypost.com/2023/01/16/the-looming-debt-ceiling-crisis-is-too-big-for-the-fed-to-ignore/amp/
We are in a similar (or worst) situation compared to 2011.
Don't buy any stocks or even sell.