Texas annexation
President Tyler expected that his treaty would be debated secretly in Senate executive session. However, less than a week after debates opened, the treaty, its associated internal correspondence, and the Packenham letter were leaked to the public. The nature of the Tyler-Texas negotiations caused a national outcry, in that "the documents appeared to verify that the sole objective of Texas annexation was the preservation of slavery." A mobilization of anti-annexation forces in the North strengthened both major parties' hostility toward Tyler's agenda. The leading presidential hopefuls of both parties, Democrat Martin Van Buren and Whig Henry Clay, publicly denounced the treaty. Texas annexation and the reoccupation of Oregon territory emerged as the central issues in the 1844 general election.