But perhaps the thorniest problems of all came from within Harrisburg.

Source: https://www.mcall.com/2023/12/13/gov-josh-shapiro-rebuilt-a-bridge-weathered-a-messy-budget-and-walked-fine-partisan-lines-in-2023/

But the accord did not resolve tensions over some of the thorniest issues affecting the region, such as a unified approach to deforestation and whether to limit fossil fuel extraction in the delicate ecosystem.

Source: https://grist.org/international/summit-to-save-the-amazon-from-the-point-of-no-return-yields-mixed-results/

First, we begin our extended discussion of the ungovernable House with the thorniest of thorns.

Source: https://slate.com/news-and-politics/2023/09/the-surge-matt-gaetz-kevin-mccarthy-house-speakership.html?via=rss

One of the outstanding items was the EV tax credits, and it also proved to be one of the thorniest.

Source: https://www.politico.com/news/2023/06/25/manchin-biden-electric-vehicles-00102460

One of the thorniest questions in retirement is how to pay for long-term care, should you need it.

Source: https://www.moneytalksnews.com/slideshows/expenses-that-retirees-underestimated/