Taylor did believe that the president could veto laws, but only when they were clearly unconstitutional. He did not favor chartering another national bank, favored a low tariff, and believed that the president should play no role in making laws. Taylor did believe that the president could veto laws, but only when they were clearly unconstitutional. Many southerners believed that Taylor supported slavery and its expansion into the new territory absorbed from Mexico, and some were angered when Taylor suggested that if he were elected president he would not veto the Wilmot Proviso, which proposed against such an expansion.