Because he failed to live up to the Whigs expectations . -A.M.G
Northern Whigs became Republicans, Southern Whigs became Democrats
Tyler was expelled from the Whigs after he vetoed the second bank bill.
John Tyler's strong support for states' rights alienated him from both the Democrats and the Whigs in Washington, D.C. Tyler was also a strict constructionist and vetoed several of the Whigs' bills for being unconstitutional even though he was a Whig himself.
John Tyler was ejected by the Whigs after he vetoed the bill to recharter the Bank of The United States.
John Tyler was elected on the Whig ticket, but nonetheless spent a great deal of his presidency feuding with other Whigs. Tyler was the 10th President of the United States.
Because he failed to live up to the Whigs expectations . -A.M.G
After Tyler vetoed a bill to re-establish a bank of the United States, he was expelled from his Whig party. The banking bill had been pushed through Congress by the Whigs and re-establishing the bank had been one of the Whigs' long-time goals. The veto made them furious.
The Whigs kicked him out of the party in September 1841.
In 1839, the Whigs offered the vice-presidency to Webster to run with William Henry Harrison. but he refused. The Whigs won the election in 1840. William Henry Harrison was elected President with John Tyler his running mate.
John Tyler was associated with the Whig party when William Henry Harrison was still in office. After the death of Harrison, Tyler succeed him, becoming president, but in the midst of his presidentacy, he change his platform party, vetoing several bills proposed by the Whigs.
John Tyler was elected vice-president, but became president upon the death of William Henry Harrison, just a month after he took office. The Whigs passed a bill to charter a third bank of the United States, as they had promised to do. Tyler vetoed it. They passed another version and Tyler vetoed that one too. His cabinet then resigned in protest.