federal revenue, to achieve another of his presidential goals, eliminating the national debt. The issue developed into a personal rivalry between the two men. For example, during a celebration of Thomas Jefferson's birthday on April 13, 1830, the attendees gave after-dinner toasts. Jackson toasted: "Our federal Union: It must be preserved!" – a clear challenge to nullification. Calhoun whose toast immediately followed, rebutted: "The Union: Next to our Liberty, the most dear!" As a compromise, Jackson supported the Tariff of 1832, which reduced the duties from the Tariff of 1828 by almost half. The bill was signed on July 9, but failed to satisfy extremists on either side. On November 24, South Carolina had passed the Ordinance of Nullification, declaring both tariffs null and void and threatening to secede from the United States if the federal government tried to use force to collect the duties. In response, Jackson sent warships to Charleston harbor, and threatened to hang any man who worked to support nullification or secession. On December 10, Jackson issued a proclamation against the "nullifiers", stating that he considered "the power to annul a law of the United States, assumed by one State, incompatible with the existence of the Union, contradicted expressly by the letter of the Constitution, unauthorized by its spirit, inconsistent with every principle on which it was founded, and destructive of the great object for which it was formed". South Carolina, the president declared, stood on "the brink of insurrection and treason", and he appealed to the people of the state to reassert their allegiance to that Union. Jackson also denied the right of secession: "The Constitution ... forms a government not a league ... To say that any State may at pleasure secede from the Union is to say that the United States are not a nation." On December 28, Calhoun, who had been elected to the U.S. Senate, resigned as vice president. Jackson asked Congress to pass a "Force Bill" authorizing the military to enforce the tariff. It was attacked by Calhoun as despotism. Meanwhile, Calhoun and Clay began to work on a new compromise tariff. Jackson saw it as an effective way to end the confrontation, but insisted on the passage of the Force Bill before he signed. On March 2, he signed into law the Force Bill and the Tariff of 1833, both of which passed on March 1, 1833. The South