Other issues than the tariff were still being decided. In May 1830, Jackson vetoed the Maysville Road Bill, an important internal-improvements program (especially to Kentucky and Henry Clay), and then followed this with additional vetoes of other such projects shortly before Congress adjourned at the end of May. Clay used these vetoes to launch his presidential campaign. In 1831, the rechartering of the Bank of the United States, with Clay and Jackson on opposite sides, reopened a long-simmering problem. This issue was featured at the December 1831 National Republican convention in Baltimore, which nominated Clay for president, and the proposal to recharter was formally introduced into Congress on January 6, 1832. The Calhoun-Jackson split entered the center stage when Calhoun, as Vice President presiding over the Senate, cast the tie-breaking vote to deny Van Buren the post of minister to England. Van Buren was subsequently selected as Jackson's running mate at the 1832 Democratic National Convention held in May.