President Jackson responded with a proclamation denying the right of nullification, and asked Congress for authority to collect the revenue in South Carolina by force if necessary.
Congress passed an act gradually reducing the duties to a revenue basis, and South Carolina repealed her nullification measures.
The tariff of 1828 aroused bitter opposition in South Carolina, and called from Vice-President Calhoun the statement of the doctrine of nullification which was adopted by the South Carolina legislature at the close of the year and is known as the South Carolina Exposition.
Green, however, continued to edit it in the Calhoun interest until 1835, and gave vigorous support to that leader's nullification views.
He became prominent, politically, during the nullification excitement of 1832-1833, as a vigorous opponent of nullification, and from 1836 to 1845 he sat in the United States Senate as a Unionist Democrat.