Can you go to law school with a bachelors in international relations?

Yes, individuals who pursue law school come from a variety of educational backgrounds. There is no prescribed bachelor's degree for law, although some students take a pre-law tract to ensure they take the required prerequisite coursework. Still it is a tract, not a degree. If you wish to practice corporate law then a bachelor's degree in business would be a consideration, if criminal law then a bachelor's in criminal justice might be a consideration.