Biddle requested a renewal of the national bank's charter in January 1832, setting off what became known as the "Bank War." With Clay focusing on a tariff bill, Webster became the unofficial leader of pro-national bank forces in the Senate. He helped ensure that Congress approved a renewal of the charter without making any major modifications, such as a provision that would allow states to prevent the national bank from establishing branches within their borders. Congress approved the charter renewal, but, as was expected, Jackson vetoed the bill in July 1832; Jackson argued the bank was unconstitutional and served to "make the rich richer and the potent more powerful." On the Senate floor, Webster attacked the veto, arguing that only the judicial branch could judge a bill's constitutionality. Afterward he supported Clay's presidential campaign and continued his efforts on behalf of the national bank, but Jackson was re-elected by a decisive margin.