The Senate is looking to pass legislation within the next month that would roll back restrictions on swaths of the finance industry. Such legislation would constitute the most significant loosening of rules imposed in the wake of the 2008 financial crisis. Buoyed by their success in rewriting the tax code, Republican lawmakers now aim to help the financial industry relax many post-crisis rules and regulatory obligations, particularly for thousands of small- and medium-sized banks. The bill would allow hundreds of smaller banks to avoid certain elements of federal oversight.